Hello, and welcome to my Miss Fortune guide. My name is TheAceOfStaves, and I would appreciate any and all feedback you have, so if you have any, please leave a comment. Before you upvote or downvote this guide I would ask that you try it out in a couple games- this way you can see for yourself if it works. I made this guide because I enjoy playing Miss Fortune, but she took a hit when they ruined the Ghostblade in the assassin update, which was her old starting item. This left a bit of an interesting issue of how to build her, some people ditching Armor Penetration/Reduction entirely and going for crit builds, others using Duskblade and other weird items to make cheesy/gimmicky builds that are either not very effective or hard to use. I set out to prove that the Armor Pen build- characterized by it's frequent, devastating ultimates- lives, although somewhat changed. Without any further delay, I present Guns Blazin'- the S7 MF ArPen build.

Pros

+ Easy to Learn + Strong Laning Phase + Low Cooldowns + Fast + Big AoE Damage

Miss Fortune has some very strong characteristics. She's fairly easy to pick up. She has a very strong laning phase using her Q to deal good damage in the form of safe poke, her W and Love Taps to deal big damage to turrets, and she can use her E to peel for herself or chase. Her cooldowns are fairly low. She's quite fast and can reposition easily. And finally, she deals a lot of damage between her Love Taps, Q, and Ulti, and she does it to multiple targets.

Cons

+ No Dashes + Roots Herself During Ulti + Ult can be Interrupted + Can be Counter-Picked very hard

Like any champion, she also has some weaknesses. Notably, while she IS quite fast, she's NOT mobile, meaning she has no dashes. This means you have to be very vigilant and predict where enemies will shoot their skillshots to try and dodge them. It also means you really don't have a way to survive if you're caught out. Also, her Ulti, death machine that it is, roots her in place and paints an enormous juicy target over her head when she uses it. It can also be interrupted fairly easily by any displacement whatsoever, although there is counterplay to this (more on that below). Finally, there are some picks which will absolutely ruin her damage potential- specifically, Yasuo and Braum.

Skilling Order #1. Bullet Time 6 / 11 / 16 #2. Double Up 1 / 3 / 5 / 7 / 9 #3. Strut 2 / 8 / 10 / 12 / 13 #4. Make it Rain 4 / 14 / 15 / 17 / 18

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Quintessences Greater Quintessence of Attack Speed: These provide a touch of attack speed to make last-hitting a bit easier. Marks Greater Mark of Attack Damage: This provides early AD to make last-hitting easier, as Miss Fortune's base AD is terrible. Seals Greater Seal of Armor: These provide some early defense against the enemy ADC. Glyphs Greater Glyph of Magic Resist: These help defend against magic damage supports, junglers, and midlaners early game.

Your ultimate does much more damage while using this build.
Math-

Say that you used the example full build listed at the top.
60+75+50+65+70= 320 AD from items,
+ ~8 AD from runes,
+ 63 base AD at level 18,
= 391 AD.
Your ultimate at level 3 fires 16 waves, each doing 75% AD physical damage. You took Infinity Edge, so 3 waves should crit for an extra 30% damage per wave.
391*.75*13= 3812(waves that did not crit)
+ 391*.75*1.3*3= 1144(waves that did)
=4956 damage(4692 if no waves crit)
That's 4956 damage against an unarmored target that takes the whole ultimate. Including Deathfire Touch-
Ultimate lasts 3 seconds and applies DFT on every wave,
DFT lasts 2 seconds (AoE ability),
= 5 seconds of Deathfire Touch damage
DFT damage = .15 bonus AD+2 damage per second,
328 bonus AD = 49+2= 51 * 5 seconds = 255 damage.
That's 5211 (4947 if no waves crit) damage against an unarmored target that takes the whole ultimate.

Now let's suppose you used a standard Crit build, Essence Reaver, Infinity Edge, Bloodthirster, Last Whisper, Zeal, and boots, and took Warlord's.
70+70+75+50 = 265 from items
+63 base AD at level 18
+ ~8 from runes
= 336 AD/273 bonus AD
Your ultimate would deal 30% extra damage for every wave that crits, and you have 70% crit chance, so let's assume that 11 waves crit.
336*.75*5 = 1260(waves that did not crit)
+ 336*.75*1.3*12 = 3604 (waves that did)
= 4864 damage
And that's assuming that all of the waves that were supposed to actually did crit.