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While this may seem hard for most players its actually easy after you get level 6 you might have a chance to kill him pre 6 with the help of your jungler. If the Aatrox knows his champ he won't let you play the game
Ahri
Really easy matchup, dodge her charm and you should win trades easily. Care for her level 6 because it can get a little bit tricky and if she hits her e you are actually dead
Akali
Not hard to deal with you can bully her perma q early game unless she plays with fleet. Do not try to 1 v 1 her unless you are 100% sure you win the trade, she can do some ninja **** and burst you down in an instant. Care for her level 6 because if she jumps on you, you are pretty much dead unless you dodge her second r.
Anivia
Not hard you can always outrade her just care for her wall before 6 since she can just w + q you and set easy ganks for her allies
Annie
Pretty easy matchup do not over push the wave since she can allow her jungler to come whenever with the pointclick cc she has. Also care for her e when you go for the all in
since she can absorb a lot of your damage
Aurelion Sol
Haven't played it too many times since it's not in the meta anymore pretty easy matchup you insta win after 6
Azir
One of the most free matchups for Kassadin you just outscale him as the game goes on
Brand
Just don't get hit by his q and you win automatically. I highly suggest you to take Electro and smash his face
Camille
Could possibly be the worst matchup for Kassadin she outroams you , dives you and you really can't do anything about it. I always pick Camille when they take him from me and it's just an instant win. Whenever you see it just dodge it it's unplayable
Cassiopeia
Skill matchup. Try outplaying her q's by doing weird movements you can actually get out of her miasma if you are quick enough. Dodge her ult and you will be fine
Cho'Gath
Pretty sad to play against he perma slows you and you can't press r because of the silence. Should be pretty easy if your jungler actually listens to your pings.
Corki
Really easy matchup you outrade him and since his auto attacks are hybrid you don't take that much damage but care for his package which can be very disgusting
Diana
Pretty even if you don't die pre 6 then you just outscale her. Do not be greedy about cs at the start since she can chunk quite a bit of your hp with her combo if she hits q on you.
Draven
I have actually seen people playing this in my games and it's not fun. Do not go for cs and call for your jungler. Take exhaust or barrier or you are doomed
Ekko
Free lane you outrade , outscale and outroam him. He never wins trades because of your q shield you can actually go after him in his roams and get ahead from them
Fiora
Pretty bad matchup because she can outheal your damage, take ignite in this matchup or you will be unable to do anything in the game.
Fizz
Fizz is a little weird, if he knows how to play he will just get fed by roaming you because he knows he can't kill you. If he decides to fight you just win lane automatically. If their jungler is annoying you never push the wave because they can dive you easily if he gets ahead
Galio
Even matchup , he can be quite annoying at fights since he can just shield everyone. You can win him 1 v 1 after some items or if he uses his aftershock
Gangplank
Quite annoying perma stacking grasp on you. First back take armguard or else you won't survive the lane. You win him after completing one item
Garen
Annoying, you win him after 6 don't ever try to fight him just e+q him whenever and don't let him get healed by his passive
Gragas
Pretty easy matchup care for his combo he does an insane amount of damage and you won't be expecting it
Heimerdinger
Easy matchup don't die pre 6 and he is just unable to do anything. Avoid getting hit by his e because his turrets are gonna chunk you for a huge amount
Irelia
Skill matchup you can win her by getting w lvl 1 and then just outscale her. Care for her 5 stacks cuz she can shred you really easily. Don't get hit by her e and you should be fine. After level 6 don't let her hit any ability or else she is gonna all in you even in the tower.
Jax
Unplayable. You can't do anything. Just sit under your tower and prey for ganks until you hit 6
Jayce
This matchup is so bad for you he can bully you and all in you whenever if you do a mistake take scaling runes and outscale him
Kalista
I firstly encountered this in my euw unranked to grandmaster. You can't move at all she can harass you while farming and all in you whenever she wants. She can also dive you with enemy jungler. Highly recommended to dodge this unless you are duoq with jungler
Karthus
Haven't played this yet but since karthus mid is meta now... Just juke his q's you can also cancel his r with your q
Karma
Pretty easy to deal with since she doesn't do that much damage. Wait for her shield to run up before trading
Katarina
The matchup is in your favor unless she starts with longshord, she can actually kill you early levels with longsword if you do a mistake. But should be pretty free unless she goes bot and gets a triple kill :)
Kennen
Pretty annoying with his stuns, just take mercury's and win him you also outscale him so should be free
Kled
Hard lane since he can dash twice, dodge his q or else you are either gonna die or get lose the 90% of your life. Care after his 6 since he can dive you whenever with Skarl
Kog'Maw
This isn't gonna be a fun lane after he takes Rylai's you are gonna be vulnerable to ganks for the whole game with the insane amount of slow he has. Try roaming and get yourself ahead or try helping other lanes since he is gonna be playing away from you for the whole game
LeBlanc
Pretty easy matchup, if she takes first item doran's blade let her be till you get level 6 since she can just harass you. After 6 care for her chain if you get chained once you will be chained twice..
Lissandra
Despite the fact that she doesn't have any kill pressure on you but she can be an amazing assister to the her team with this cc. Even if you get ahead she will always be more useful than you, so try one shotting her with flash before the fight starts. (take mercury's or tenacity runes at all costs)
Lucian
For the most experienced this should be easy. Take double armor runes run ignite or exhaust (up to you) play with electro and kill him after 6. Armguard tabis and shall be a free lane
Lux
easy matchup dodge her q's and you outrade/outscale her
Malphite
very easy q when he q's and outrade him with your e
Malzahar
Pretty easy you outrade him, you can actually cancel his ult if you time it correctly, you can also e his voidlings
to kill them all.
Master Yi
This is unplayable highly recommend you to dodge, he can dive you lvl 2 unless you have exhaust or barrier and after cutclass your arent able to play the game
Mordekaiser
Pretty even if you dont die pre 6 avoid getting hit by his e or else you are probably gonna die . Short trades with q w e just to prock electrocute are optimal
Morgana
Pretty annoying (take cleanse tenacity runes)
Neeko
you might wanna take d shield for that since she can go on hit neeko and it's not fun to play against. you outscale her tho
Nocturne
extremely hard, if you get hit by his q and you dont leap away you are gonna die in a snap of a second. Don't try to trade him its impossible unless your jungler camps you, take exhaust and scale or dodge the game
Nunu & Willump
kassadin is a counter to this actually, lean towards enemy tower to prevent him one shotting your wave with his snowball. Pretty easy since you can cancel both his snowball and ultimate with your q
Olaf
dodge this, if he hits 1 axe you are dead and lane is over
Orianna
if an orianna is good she won't let you play the game take anything you want to outsustain her, if she is bad must be a free lane for you. After she get's ludens care she can one shot you
Pantheon
Take d-shield/armor/corrupting its up to you just don't die or do anything stupid. You do 1 mistake and lane's over he is gonna influence all lanes if he gets ahead in kills take tp/exhaust to catchup with him in his roams after 6. You will outscale him after some point
Pyke
Take sword trades with your autpo+ w q/e to win them. If you see him trying to q you can q before he lands a hook so it gets canceled. Try juking his e or leaping away from it since he can chunk quite a bit of your hp
Qiyana
If she hasn't started with refillable and has a long sword you can try to 1 v 1 her lvl 1 starting with w. Highly recommended to take d-shield and smash her in lane. If she roams you and gets fed by your team then good luck :D
Quinn
Kinda cringe to play against, d-shield and armguard are optional. Don't ever try to trade her before 6 since she can melt you down after she gets cutclass
Renekton
I preferably love this matchup, start w first go d-shield with electrocute. If he starts with w it's worse for you but still can win it if you ignite him before he pressed empowered ability(take double armor)
Riven
This lane is so bad, you can't even move out of lane she can literally outroam you and is pretty hard to deal with. Stay near tower and hope someone roams to help you
Rumble
Skill matchup, dodge all his e's and you are good to go. Mercury's is a must on this ( don't underestimate his ultimate)
Ryze
He can do quite a bit of damage early game if he times your shield correctly try trading him after you get two points into your q to absorb most of the damage. The lane must be easy to play since he doesn't have a roam threat. You can also cancel his r with your q to prevent him from escaping/roaming
Sett
HA HA HA. Seriously now tell your jungler to set a tent to your lane before he gets level 6. If he gets level 6 he can cancel your ult animation with his ult and there's no escape then. Once he gets cutclass you insta lose. Consider dodging
Swain
Pretty even. He can try cheesing you with his jungler anytime and the health he gets from his ult is kinda disgusting. Try taking short trades poking him out slowly till you all in him
Sylas
One of the easiest matchups for Kassadin, does he try to trade you you shall win by playing close to your tower. After he goes for an all in ignite him the second you see his w animation and kill him. After this lane should be really easy
Syndra
Pretty even , try avoiding getting hit by her q's but the major concern here is to not get hit by her e or else she is gonna chunk your hp . Mercury's is good here also if you want to win the lane, you outscale so don't worry
Taliyah
No one play's taliyah mid anymore but should be easy. You cancel her q with yours, just don't get hit by her w and you should be fine. You can also cancel her ultimate with your q.
Talon
Pretty hard to deal with, even if he is 0/5 he still can one shot you with his ultimate for no reason at all. Fight him when his ignite is down, or cheese him lvl 1 with w
Teemo
Easy matchup. Block his q with yours and should be free win. Really annoying though
Tristana
Double armor is a must, take exhaust survive the lane and outscale her
Tryndamere
Don't die pre 6 and you shoud be fine, barrier works in this exhaust as well. Try juking his w by leaning forward to him.
Twisted Fate
Pretty easy lane he never outrades you nor outscales you, but he can be quite a good tool when getting ganked with his pointclick cc
Vayne
Dodge, unplayable unless you play with exhaust/barrier and make your jungler your little buddy and perma camp you which is something that won't happen
Veigar
One of the easiest matchups for Kassadin. You have a free lane counter his e with your ultimate and can absorb a lot of his damage with your q, you also outdamage him so it's pretty easy
Vel'Koz
Pretty hard matchup, he will always outrange you, you will have trouble poking or getting close to him to actually damage. After somepoing he will q + ult you so care about his powerspike. Dance like a Michael Jackson and you shall be fine
Viktor
Pretty easy matchup. Only played it twice but he really can't do anything since you outroam him and outrade him , after hitting 6 this should be free
Vladimir
Pretty even, even though Kassadin is considered a counter to vlad he can actually be beaten if you do some common mistakes such as trading his empowred q with yours. Care for his flash all in combo since it will be really quick and won't respond to it on time. Should be free by the time you hit 6. Try chunking him a bit and then combine flash + r onto him for an easy kill.
Wukong
This is so bad to play against, if you missplace the wave you are never gonna play the game ever again or be 4 levels below him. He outrades you after he gets his w so try killing him level 1 with w first
Xerath
Not a big threat, just don't stand next to wave when you see him charging up his q, this will make him decide if he wants to have a good wave or poke you. After 6 ult e q and retreat back, avoid getting hit by his e or he is gonna chunk you for a good percentage of your hp
Yasuo
You can try killing him level 1 with w and d shield, or just play the lane passively till you get 6. After he takes his boots do not try approaching , since he is good at taking last longing fights
Yone
Same with Yasuo, skill matchup try to win him pre 6 he is quite weak early so try taking advantage of that, rush armguard.
Zed
This is a skill matchup as well, while most of them are terrifying if you notice that he isn't playing with conqueror try trading him lvl 1 with your w, and then try flashing your combo and he should die to ignite. If he has conqueror concede the lane a bit and rush zhonyas(no joke)
Ziggs
Pretty easy, avoid his q's kill him at level 6 and snowball
Zilean
Very easy to play against, can be annoying and probably be diving you permanently with his jungler so care for that. His wave pushing is insane.
Zoe
Don't get hit by her e's and you should be fine. Try timing her q with your ultimate for a good easy trade
Zyra
Nobody play this anymore, but should be pretty free to play against if you don't greed for minions
Cutting a burning swath through the darkest places of the world, Kassadin knows his days are numbered. Though once a notorious adventurer, he had chosen to live anonymously and raise a family among the nomad tribes of Shurima—until the day his daughter was claimed by the Void. Kassadin vowed to bring her back, combining a number of arcane artifacts and forbidden technologies for the struggle ahead. His precautions were not enough, however, and these devices now only serve to slow the insidious corruption that ravages his body... but he will gladly pay that price, if only he can save her...
Hi, I'm Faded, a 16 years old player that's been playing since mid season 2. During that time I've hit Master tier as a mid lane main in season 7, as a jungle main in season 8, and Grandmaster in season 9 playing a mix of mid jungle and support. I can play every role to a very high level and have a very good understanding of the general aspects of the game on top of that. You can watch me streaming every day at https://www.twitch.tv/fadedreformd .
I made a very easy guide that everyone can follow and climb with. I'll add more and more details as time flows + update the guide for you guys.
Kassadin is like the mage version of a hypercarry: while many think that kassadin's early game is weak im here to prove them wrong,even if you missplay early game he will progressively scale up and become one of the most broken late game champions.He is probably going to be the strongest champion on the map. His mobility from his ultimate is extremely effective for both aggression and defense, and it makes him very hard to lock down and shut down once he has enough CDR and mana. His early-game can be frustrating to get through, but the reward for it is getting to play one of the most fun champions in the game in mid-late game.
Rune Explanation
KEYSTONE
Electrocute is one of the best runes to run on Kassadinsince it provides him enough damage to all in his opponents and snowball the game with his early burst damage, which is gonna scale even harder in late game making it easier to one shot these annoying enemy carries.
MAJOR RUNE
Taste of Blood With how weak Kassadin is pre-6 the extra healing from this rune will dramatically help him. Together with Ravenous Hunter you'll be hard to poke out early and sustain easily late..
MAJOR RUNE
Eyeball Collection has been confirmed to be the best out of the three options and it's far the most optimal rune to pick when playing Kassadin.
SITUATIONAL
Ravenous Hunter Just like Taste of Blood this rune will help Kassadin with his weak sustain. However this one scales into the mid-late game with a dramatic amount of healing from every single ability. With the amount of healing of your all abilities + Rod of Ages and your Riftwalk it will make you sustain longer in the fight.
Pretty Similar with the last rune page with a slight difference.
KEYSTONE
Electrocute is one of the best runes to run on Kassadinsince it provides him enough damage to all in his opponents and snowball the game with his early burst damage, which is gonna scale even harder in late game making it easier to one shot these annoying enemy carries.
MAJOR RUNE
Taste of Blood With how weak Kassadin is pre-6 the extra healing from this rune will dramatically help him. Together with Ravenous Hunter you'll be hard to poke out early and sustain easily late..
MAJOR RUNE
Eyeball Collection has been confirmed to be the best out of the three options and it's far the most optimal rune to pick when playing Kassadin.
SITUATIONAL
Ultimate Hunter Is a great rune to be combined with your Riftwalk, it's mainly used against full ad teams or mainly tanks since you get to press Riftwalk every 0.78 seconds at level 16 making enemy tanks unable to get to you and spam dashing through your enemies until they have no abilities left, more often than not you are going to build Frozen Heart since enemy team will be all ad
This runepage is mainly played against ap matchups that poke a lot so you can get through out the lane without dying.
KEYSTONE
Fleet Footwork All Kassadin can do in early levels is survive. Fleet Footwork is fully effective on minions as a melee champion and scales very well from ability power. Together with the domination runes you'll be harder to poke out. Take it in specific matchups that can poke you out of lane easily.
MAJOR RUNE
Presence of Mind scales very well with Kassadin since it adds 500 maximum mana and takedowns restore the 20% of maximum mana and we all know how well Kassadinscales with mana and how crucial it is for his kit.
MAJOR RUNE
Legend: Tenacity The other 2 options do nothing for Kassadin but free tenacity is very powerful against mostly any champ because there isn't a single champ that doesn't have an ability with cc..
MAJOR RUNE
Coup de Grace This is the only reliable option in this row. You'll never make great use from Cut Down as your targets will have less health than you and Last Stand is too situational.
KEYSTONE
Conqueror Conqueror is mainly played against ad/tank teams, it can provide you with insane healing and damage in the later points of the game and also some very defensive stats since you are gonna be building quite a bit of armor ingame.
MAJOR RUNE
Presence of Mind scales very well with Kassadin since it adds 500 maximum mana and takedowns restore the 20% of maximum mana and we all know how well Kassadinscales with mana and how crucial it is for his kit.
MAJOR RUNE
Legend: Tenacity The other 2 options do nothing for Kassadin but free tenacity is very powerful against mostly any champ because there isn't a single champ that doesn't have an ability with cc..
MAJOR RUNE
Coup de Grace This is the only reliable option in this row. You'll never make great use from Cut Down as your targets will have less health than you and Last Stand is too situational.
MAJOR RUNE
Sudden Impact This rune is crucial in this build because besides the penetration, it also gives you a quite good amount of damage since you will be spamming Riftwalk all game.
MAJOR RUNE
Ultimate HunterIs a great rune to be combined with your Riftwalk, it's mainly used against full ad teams or mainly tanks since you get to press Riftwalk every 0.78 seconds at level 16 making enemy tanks unable to get to you and spam dashing through your enemies until they have no abilities left, more often than not you are going to build Frozen Heart since enemy team will be all ad or tanks.
Spells
MAJOR SPELL
Flash is the best summoner spell in the game, almost every champion takes it and it's completely irreplaceable. It's the best defensive summoner and the best offensive summoner all at once. The fact that you see all 10 players take this in 99% of games just goes to show how strong it is. Kassadin has no escapes before level 6, and even at level 6 Riftwalk has a decent cooldown, so this is absolutely essential on him.
SITUATIONAL SPELL
Ignite is obviously a much more aggressive option, one that gives him some more kill potential both early-game and late-game. There are not drawback to ignite unless you are playing cringe matchup and need tp to scale for next season. Even if you're in a tough lane matchup most often than not it helps you pick an early kill and win the matchup easily. It's still strong late-game during team-fights and gives you some extra burst damage and some anti healing just in case you might need it for fight or laning.
SITUATIONAL SPELL
Exhaust This is one of the spells that isn't picked as much as Ignite or Teleport, but can give you an insane amount of help during the laning phase, making enemies have a hard time killing you. Some of the lanes I would pick that against is cringe burst champs that bully you all game long such as Talon Tristana Draven and pretty much ad carries.
SITUATIONAL SPELL
Barrier is another go to against ranged ad matchups and it's up to your preference between that and Exhaust.
SITUATIONAL SPELL
Teleport is the second most important summoner spell for Kassadin. Kassadin will almost always be getting shoved in and will therefore almost never be the one to get an optimal recall off (meaning while he's recalling the enemy laner can shove the next wave into tower before recalling themselves to make him miss a wave). And even when the enemy laner recalls before him, Kassadin's lack of waveclear makes it virtually impossible for him to shove a wave into the tower fast enough to avoid missing much CS himself. Teleport allows him to recall whenever necessary while being able to Teleport back into lane immediately to avoid missing large amounts of CS and falling behind. It also opens up the possibility of TP ganks on other lanes and allowing him to be a split pusher late-game(I still prefer Ignite).
Abilities
Ability Sequence
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
That's the normal ability order for Kassadin making it easier for him to roam by Riftwalking once and then Force Pulseing to clear almost whole wave. Obviously if you are against ap matchups it would be more ideal to max Null Sphere , but Force Pulse is better for roaming and ad matchups.
Void Stone
Void Stone: Okay so there's almost nothing to talk about here, it's pretty simple. "Ignores unit collision" means that you're unaffected by things such as minion block; rather than going around units (minions, champions... basically anything that isn't terrain), you'll just go through them. So things like this won't happen you. Pretty good. We all hate minion blocks don't we?
And '' Kassadin takes 15% reduced magic damage" means that Kassadin takes 15% reduced magic damage. Which helps make his laning phase against mages a lot safer. Also neat!
Null Sphere
Null Sphere: Especially when combined with Summon Aery or Arcane Comet and Scorch, this spell is actually pretty strong at trading. The damage in early levels is pretty comparable to other spells, and the shield makes it out-trade almost any spell, especially when taking Void Stone into consideration. But after getting nerfed you should take two points to farm safely and trade.Of course if you are playing an ap matchup it would be better to max it first.
Void Stone and Null Sphere's shield together make Kassadin far better in lane against AP champions than AD champions, so if possible try to avoid picking Kassadin into AD matchups. But you will be able to win ad matchups easily with the help of this guide so thank me later:).
Often you'll need to use this spell to last-hit minions rather than just solely harassing your enemy. While Kassadin has very little kill pressure in early levels anyway many players underestimate his damage and you can pick early kills by slowly poking your enemy down and finishing them with Flash Electrocute and Ignite.
Nether Blade
Nether Blade: The increased auto-attack damage from Nether Blade's passive is a massive help for your last-hitting, which is very much welcome since a lot of your last-hits will be done under tower. It's also a not negligible boost to your auto-attack DPS on enemy champions, which definitely isn't unwelcome.
The active is a spell that is very important for you both in laning phase and out of it. In laning phase it's very good for helping you last-hit under tower, especially when used as an auto-attack reset, but most importantly, by spamming it on minions every chance you get you're going to be getting a ton of mana back from it, which will sustain your playstyle of spamming Null Sphere on your opponent as well as often using it to last-hit.
Outside of laning phase, it becomes a huge nuke when combined with Lich Bane, and the mana restore will start to restore massive amounts of mana, making it hugely beneficial to manage to hit anyone with Nether Blade, given Kassadin's massive mana costs on Riftwalk.
It's better to upgrade Nether Blade against ad matchups such as Zed or Qiyana, you can try harrasing them whenever they go to last hit and also outdamage them with the passive of Nether Blade resulting in an easy early kill and then snowballing the game.
Force Pulse
Force Pulse: This is a very unique spell because of the fact that it has 2 "cooldowns"; the regular CD any spell has, and the fact that it needs to charge up to 6 nearby spell casts before it can be used again, even if it is off cooldown. The downside of this is that it makes it have a generally long CD in laning phase. The good news is that in team-fights there are so many spells being cast that it takes no time at all to reach 6 charges, giving you an AoE nuke that doubles as a very strong slow, on a cooldown of 3.6-3.8 seconds.
It's common to start putting points in this spell after you level up your Null Sphere twice to start giving you some wave-clear, and end up maxing it before Null Sphere.
It can also become a great tool to prock Electrocute and trade safely from a distance.T he amount of slow it gives you is very important during fights and trying to get away from enemies too.
Riftwalk
Riftwalk: This spell is what defines Kassadin. After skilling this Kassadin becomes one of the most mobile champions in the game, and at rank 3 Riftwalk he becomes the most mobile champion in the game with no one coming close to his mobility; provided he has the mana to sustain his Riftwalk spam. That's why Kassadin builds focus so heavily on mana, since it's extremely important for him to have a large enough mana pool for multiple consecutive Riftwalks in a team-fight.
During fights or all ins you should always have the 400 or 800 mana Riftwalk by stacking it 3 or 4 times. Combine your max stacked Riftwalk with your flash to oneshot enemy carries and single handly win the fight.
The combo for when you're not in range for Nether Blade after Riftwalk. This combo needs explaining because the order of the spells is important. Casting Force Pulse before Null Sphere may sound like such a tiny and pointless detail, but it can actually make a huge difference in a large number of situations. The speed of the combo is the same no matter which order you use, but you want Force Pulse to hit first because:
1. It has a smaller range than Null Sphere; if you cast Null Sphere first the enemy may not be in range for Force Pulse anymore by the time you cast it. You have a slightly more limited window to land this than Null Sphere, so you want to get it through ASAP.
2. If the enemy Flashes away after the first spell, you'll have slapped them with a slow to help you chase them and possibly allow you to get close enough for Null Sphere without even having to cast an extra Riftwalk. If you're casting Null Sphere first, here's what happens instead: you Riftwalk in, cast Null Sphere, they Flash away, then you Force Pulse the air... Which isn't even a possibility with the reverse because Null Sphere is point and click, meaning it's impossible to waste a spell with that combo.
3. Slightly less important but can still potentially have a big impact in rare situations: You generally want to get Force Pulse on CD ASAP so the rest of your spells (as well as the enemy spells) begin charging it up for the next cast. If you cast Null Sphere before Force Pulse that's one charge you're guaranteed to miss out on, and you could potentially miss out on more from other champions' spells during the short time you're casting Null Sphere.
The combo for when you are in range for Nether Blade after Riftwalk! Again the order is important. When I was new to Kassadin I would just spam my spells in any random order every time I went for this kind of combo, not really knowing what I was doing, but as always there's an order that's most efficient and important to follow for those occasions when it'll be the difference in getting a kill or not.
The logic for Force Pulse before Null Sphere is the same as before. The reason you want to use Nether Blade first is that it's your only melee range spell; it's the only spell that becomes impossible to immediately land if an enemy dashes or blinks away from you. Both Force Pulse and Null Sphere can often still reach an enemy that dashes/blinks away from you if you were in melee range of them. Additionally, since Nether Blade is the hardest spell to get in range for, it's important to get its damage through while you can rather than risk an enemy managing to get too far away for you to land it while you're busy casting your other spells. And finally, Nether Blade can restore you a ****load (800+) of mana; if you're going to need to Riftwalk again any number of times, it's important to be absolutely sure you land Nether Blade to ensure you can cast Riftwalk as many times as you can.
Riftwalk -> Flash
Riftwalk is one of many spells that allow you to Flash during the spell's cast time. All this basically means is that this is a harder to react to version of Flash -> Riftwalk, since if you Flash first then begin casting Riftwalk the enemy has a chance to react to it between the Flash and the Riftwalk, but if you do Riftwalk -> Flash, the Flash and the Riftwalk will occur at almost the same time, giving them much less time to react.
This is an especially important combo for when you want to burst down a far-away enemy while landing the damage of Riftwalk (and Nether Blade), rather than using it just as a gap closer for your Force Pulse and Null Sphere. A late-game Riftwalk can do up to 800+ damage, so being able to land it is a huge deal for bursting enemies down.
While we're on the topic, Force Pulse is also another spell that allows you to Flash during the cast time. This ls not as important to talk about because Flash -> Force Pulse is extremely hard to react to anyway, but once you're aware of it, there's no reason not to use Force Pulse -> Flash just to get a combo slightly harder to react to. It'll almost never make a difference, but it's worth it just for the rare occasions it does net you a kill.
Items
Dark Seal
Dark Seal + Refillable Potion: Almost every mage starts Doran's Ring over Dark Seal, but Kassadin is the exception since he benefits much more from straight up mana rather than mana regen. It also allows him to start Refillable Potion which saves him a lot of gold on Health Potions (which are important to get him through the weak stage of his laning phase), and gives him the option of buying a cheaper Corrupting Potion on one of his first backs if he has the gold for it. If you do have Ignite you should take 3 Health Potions instead of Refillable Potion since you can't afford to base as early as if you had Teleport.
Doran's Shield
Doran's Shield: Doran's Shield is a great item and is mostly played against ad matchups such as Zed Yasuo Qiyana etc. It give you the very useful passive of an additional 5 physical damage on hit to minions so even if you are pushed under tower you can last hit easily. It also gives you some regeneration after getting hit by an enemy champion which is very useful at trading early on.
Rod of ages
Rod of Ages: The most important item for Kassadin since it gives him all the stats he could want; most importantly the most mana of any item he'll be building. It's important to rush it before any other item as the passive gives stats that scale per minute, and it's obviously beneficial to have the most stats as early as possible. You should always go for Blasting Wandif you have the money or if you don't, just take 2 Amplifying Tome.
Sorcerer's Shoes
Sorcerer's Shoes: Kassadin deals all magic damage and is a burst assassin. This leaves him with only one viable boot choice which is the pen boots. You could situationally get Ninja Tabi or Mercury's Treads against some comps but you'll more often than not be better off getting Sorcs. You should also only finish these after you finish your Rod of Ages as you need to begin the 10 minute stacking process as soon as possible.
Archangel's Staff
Archangel's Staff: Although most Tear of the Goddess based champions rush tear, Kassadin is the only champion to get both this and a Rod of Ages. RoA is a lot more time gated than tear is so you should always fully finish the RoA before you buy Archangel's Staff components. You should also buy the Lost Chapter part of the item first to continue getting useful combat stats instead of just the mana pool. Once you buy the full staff you stack tear twice as fast anyway so you won't be missing out on much.You can also purchase Archangel's Staff first and skip Rod of Ages only if you are playing the Ap Assasin/Chad Build/Snowball build. Never and I say never rush tear of the godess.
Lich Bane
Lich Bane: Combined with Nether Blade you'll have a massive auto-attack nuke. Your spells have a low enough CD that you can frequently proc this whenever you're in auto-attack range of enemy champion, maximizing its damage output. Importantly it also gives CDR and mana, very important stats on Kassadin. You should pick this up second item if you play the ap assasin/snowball that skips Rod of Ages, I wouldn't suggest you take it on the RoA build since it's not that useful, since the enemy team would have built a bunch of magic resist by the time you take it.
Zhonya's Hourglass
Zhonya's Hourglass: As a mage/assassin that has to get into melee range to maximize his effectiveness, Kassadin is constantly in situations where he can be focused. Zhonya's Hourglass allows him to spend most of his Riftwalk cooldown untargetable, making it an absolute must-have on him. You'll always get this item as either your 3rd or 4th purchase depending on if you need the extra burst or the defence of Zhonya's Hourglass first. Or you can rush Zhonya's Hourglass against surtain situations such as a fed Talon by teammates.
Void Staff
Void Staff: This item is a must-have in games with magic resistance floating about, should the game last long enough for you to require it. Every game will have enemies building some form of MR, and in this situation Void Staff is the biggest spike in damage that you can get. How early you build it depends on how early they build MR and how much, so depending on the game you'll get it either or after your Lich Bane, as your 4th or item,or as your 3rd after taking Rod of Ages and Archangel's Staff.
Mejai's Soulstealer
Mejai's Soulstealer: If you're completely crushing the game and are snowballing hard you can buy a Mejai's Soulstealer to potentially completely take over the game. Once you're at 10 stacks this item becomes worth the gold but can potentially be one of the highest AP items in the game for less than 1500g.
Morellonomicon
Morellonomicon is one of the great items to build if the enemy team is highly based on health regen/healing abilities or Ocean Drake Soul. It provides with a good amount of health and also applies grievous wounds onto the enemies making them useless in fights without their huge healing abilities.
frozen heart
Frozen Heart is an amazing item to combine with Ultimate Hunter against heavy ad or full ad teams. With Ultimate Hunter at level 16 your Riftwalk becomes 0.78 seconds allowing you to riftwalk very quickly onto them and then get out really quick.You are also allowed to build whatever you want since Archangel's Staff combined with Frozen Heart gives you the 40% cdr spike early in the game.Consider taking Rabadon's Deathcap or Void Staff if they are taking a bunch of magic resist to close games quickly.
elixir of sorcery
Elixir of Sorcery is a great item to have during teamfights since it provides you with 50 ability power , mana regeneration and also deals a quite a bit of true damage. Taking it after level 9 in order to participate in a fight is a must, since it can be a really good game closer.
rabadon's deathcap
Rabadon's Deathcap: After your core items you can move onto Rabadon's Deathcap if the enemies don't have enough MR for you to require Void Staff yet. Rabadon's Deathcap is by far the biggest AP powerspike a mage could possibly get, so Kassadin is obviously no exception with great AP ratios on all his spells assuming again they don't have a lot of MR.
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