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1. If you're going to be rushing Abyssal Mask anyway, I don't see the point in the MR shard. Just go with the double adaptive shard for clear speed like your AP page.
   
   
2. I think you'd get more out of Conditioning than Bone Plating on Amumu jungle. You should usually be avoiding the enemy jungler, and a lot of the first 10 minutes you'll spend farming. I think Bone Plating makes more sense for laners, or scrappy junglers that are very active on the map early.
   
   
3. Your item layout in the cheatsheet is not too bad, but there's currently no way to figure out when to build any of the situational items other than your early core. If a reader gets past the first 3 items (+ boots), they'll basically have to pick some of those items at random if they haven't read the full guide.
   
   
4. You don't show boots options except in the example builds. Might be worth noting if Mercury's Treads is an option for tank builds, or if you always build Sorcs on AP (then put it in the core section).
   
   
5. Trinkets & Control Wards could be added to your cheatsheet. Few players use vision correctly, so reminding them to buy and use their vision tools is nice. If you usually buy Oracle Lens on Amumu, put it in the cheatsheet and state when to switch to it in the Purchase Order title and/or the notes).
   
   
6. Shurelya's Battlesong no longer grants AP and doesn't seem to fit with the AP build at all anymore. Can probably just remove it.
   
   
7. I don't really see why you'd want Rod of Ages or Everfrost over Liandry's Torment and Rylai's Crystal Scepter. Twin Shadows also seems out of place since you aren't running Glacial Augment.
   
   
8. Your AP example build order implies you buy Sorcerer's Shoes as your 4th item (I hope you aren't getting them that late) and Rod of Ages as your 5th item. This seems sub-optimal or at least misleading.
   
   
9. Void Staff should be included in your AP build. Maybe an option for Morellonomicon too.
   
   
10. Do you always max Despair second? Bandage Toss gives you a lot more burst damage for AP builds and the cooldown goes down which gives you more CC as a tank. To my knowledge, E>Q>W is the standard Amumu skill order. If you want to break the mold, you'll need to provide a good reason for your readers to skill differently.

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1. Rammus: Seems like a strange choice for Extreme threat status. You can interrupt Powerball with Bandage Toss or Curse of the Sad Mummy, and you deal % HP magic damage while he'll likely be building armor. Rammus is better in ganks and you have better team fighting. Doesn't seem like a terribly one-sided matchup.
   
   
2. Jax: Not sure why the focus seems to be on Jax diving your ADC. There are better dive junglers and Jax can be easily squashed by CCing him in team fights since he takes a long time to scale in the jungle. I'd worry more about the 1v1 than the 5v5.
   
   
3. Rek'Sai: Rek'Sai is a she! Also your analysis of the matchup is a bit all over the place. You say she's tanky, though every Rek'Sai builds bruiser with a damage keystone right now. You also say that she doesn't really do anything outside of her ultimate, when she's not a very ult-reliant champion.
   
   
4. Rengar: Is this not a risky matchup considering Rengar's vastly superior early dueling? I'd tell people to be careful of invades on their red buff since there are like 4 bushes Rengar can chase you through.
   
   
5. Xin Zhao: Again, this matchup is much more about Xin's early dueling and gank power and less about his ability to dive your carries in team fights. You have better 5v5 unless he's fed, but he can steamroll the game before you get to team fights.
   
   
6. Dr. Mundo: Seems underrated in this list. He gets a ton of MR and tenacity for free so he can ignore you in fights. You don't have the tools to bully him early when he's weak, so I'd consider this matchup to be Mundo-favored.
   
   
7. Elise: Elise does not have a fast clear. She has a pretty healthy clear and is active on the map early, but she doesn't really take jungle camps exceptionally fast. She does have an escape ( Cocoon and Rappel can both be used to get out of sticky spots). You seem to describe her like she's a counter-jungler instead of the gank and dive queen that she is. Like Xin, the danger here is if your team gets crushed before you make it to 5v5s where you're stronger.
   
   
8. Lee Sin: You seem to underrate these early game junglers a lot. I think you simply might not have played against enough people who know how to snowball during the early game. Lee is very good at punishing junglers with poor early games like Amumu.
   
   
9. Warwick: To my knowledge, the entangle effect from Curse of the Sad Mummy does not interrupt Infinite Duress. You'll have to use Bandage Toss to interrupt his ult. Warwick is another powerful early duelist that is dangerous for Amumu, and is underrated here.
   
   
10. Zac: This matchup is outdated (pre-revert R).
    
    
11. Shyvana: I know the AP build is currently more popular, but bruiser Shyvana destroys Amumu. I wouldn't rate this matchup so low.
    
    
12. There are a number of other junglers in the Tiny threat section that I feel are underrated simply because they're hard to play properly. Champions like Graves, Kha'Zix, Kayn (Rhaast form) and Kindred can be nightmarish to deal with when they're played to their potential.

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1. You have some solid templates here that do a lot to make your guide readable and more enjoyable to look through. I especially like the colored borders around the item icons.
   
   
2. The only section of the guide that is difficult to get through is the Jungling chapter. A lot of the text is clustered together and there isn't much in the way of highlights or subheaders to give an impression of what you're talking about at a glance.
   
   
3. Under "Blue Clear" and "Red Clear", the text needs to be spaced more vertically (so just add new lines between each topic). I would also recommend left-aligning the descriptions. Centered text works great for subheaders and icons, but looks pretty bad when you have a whole paragraph of text.

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1. Skirmisher's Sabre on Amumu is less of a dueling item and more of a damage reduction tool. You can use it to make yourself more durable against a single target, such as assassins, divers and skirmishers that will get close to you and fight you. I wouldn't generally look for 1v1s on Amumu.
   
   
2. Master Yi is a bad example for a champion that you'd want to go Frozen Heart against. His Highlander allows him to ignore all slows, including attack speed slows.
   
   
3. Zeke's Convergence is a very cheap item, which makes it a bit weak for an end-game item. It's a cheap source of resistances and amps your ADCs damage if they're really strong, but in most cases you'll get more out of actual tank items (or AP if you're going for burst).
   
   
4. There is a jungle clear that is super good on Amumu that you should know about (and include in the guide). If you start Despair and use it to aggro the Raptor camp, you can solo your red buff at full HP while using zero potions. This is because your Hunter's Talisman will sap health from the raptors for several seconds, which keeps repeatedly resetting and reaggroing the camp while you're doing your red. Just turn on W, aggro the raptors, then walk to your red and start hitting it. The raptors will run back and forth and keep walking into your AoE so you keep draining health from them.
   
   
5. You should not be recalling after 3 camps on Amumu. There are a few specific junglers like Dr. Mundo and Hecarim that can recall for other reasons after clearing 3 camps, but it's way more efficient to stay on the map and clear at least 5 camps + a scuttle before recalling.
   
   
6. You can gank mid at level 3 after taking your blue side camps. You don't need to wait until you've completed Raptors to gank. If there isn't a good opportunity for a transition gank mid, just clear your raptors and red buff.
   
   
7. The gameplay info you have here is a good start, but I'd love to see more detailed information on how to play Amumu throughout the game. Stuff like how to reliably land Q, the R-Flash mechanic, how to know when to gank vs farming, and which laners to prioritize pressuring over others. There are lots of intricacies to jungling and even though Amumu is a fairly straightforward champion, I'm sure you can come up with some topics that demonstrate how your readers can play like an Amumu main rather than an Amumu novice.

As always, let’s kick things off with the cheatsheet! You obviously got two different builds here: AD & AP. It might be worthwhile to add a note to the runes saying when to go which build. Why do you have a magic resist shard in your tank build? Jungle monsters deal physical damage and its unlikely for you to run into AP threats early on.

You forgot to add completed boots to your items. Thornmail is a part of both the core and tank pool. There is also a lack of notes here, I would definitely add those as it’s not possible to figure out what items you should get looking at the cheatsheet. You can also choose to split up the “tank pool” and “ap pool” into blocks of items (e.g. “When ahead”, “When behind”, “vs Crit” etc).

Why is Rod of Ages in your AP item pool? It is not part of the core and getting it as a fourth item is exceptionally bad since you probably won’t stack it before the game ends. The explanations of the runes you take are alright, I would refrain from mentioning Summon Aery since I am pretty sure those nerfs were a long time ago so no one will understand what you are talking about there. You also mention that your lategame gets “worse” because you don’t overcap CDR with Transcendence. I don’t get where this argument comes from, are you making a comparison with another rune you aren’t mentioning here?

Now, I have some questions about your rune choices. Why do you take Demolish over Font of Life in your tank build? You already mention in your pros & cons that Amumu is weak at demolishing turrets so taking a rune aimed at that doesn’t seem to make sense. On the other hand Font of Life can be very useful since tank Amumu has a lot of CC & health. Since it is a supportive/team-enabling build getting a rune that is also aimed at that might be a better idea.

Same story for Bone Plating, why do you take it over Conditioning? Early game Amumu mainly wants to farm so you won’t be able to proc Bone Plating and not having the resists from Conditioning won’t matter. Once you get at your strong point, Conditioning gives both flat and % armor and MR which will arguably reduce more damage than Bone Plating will.

I am also uncertain about your choice of Sudden Impact over Cheap Shot. Like you mentioned in the tank runes section, you can continuously proc Cheap Shot whereas Sudden Impact is conditional since you either have to hit Bandage Toss or Flash.

Your first tip at Bandage Toss is a bit of a ramble, do you mean that if you don’t plan to gank at level 3 you should get it at level 4? I also feel like the note of “start ganking your allies at level 3” is more at home in the gameplay section rather than in the ability section.
Again, don’t mention past nerfs & buffs if they aren’t recent (if they are older than 2 patches, leave them out).

You have a lot of tips that talk about the skill sequence. Perhaps you can make a separate chapter about the skill sequence and keep it more tips & tricks specific here.

In your items section you make the same mistakes many other guide authors make:
1. Your cheatsheet and item section do not line up, items from the cheat sheet are missing in this section and vice versa
2. You explain what items do, but not when to get (most of) them.
Because you have both an AP and a tank build it makes sense to split up the item section like that as well.

You do a good job of covering (early) pathing on Amumu, but there is more you can talk about. Some examples:

• Clearing micro (e.g. do you use Bandage Toss on camps, when do you to that, do you want to kite away from camps or do you just want to facetank for a lower cd on Tantrum etc)
• How to gank (e.g. do you run into lane and toss out Bandage Toss, do you wait for ally CC, do you want to gank lanes without gank setup from where do you approach etc).
• How to teamfight/when to engage a fight. What is your goal in fights with different builds?

You got a decent amount of code here, which make the sections easy to read. The only exception to this is your jungling section. Here you use a column/table but all the text is centered, which makes harder to read. There is also no space between rows which makes it hard to discern information of the different steps.

I am also not sure what the function is of the image of the jungle camps at the start of the jungling chapter. Right now it takes up a lot of space whilst not really doing anything.

A bit more advanced: You use a LOT of different colors throughout your guide. As a result, it doesn’t have a cohesive theme. You highlight a lot of different words with a lot of different colors. I personally am not a huge fan of this since instead of highlighting important information you highlight words that are part of the league vocabulary. It also makes the text a bit tiring to read since so much things are happening in it. It is usually better to be a bit conservative with text effects.

It could be a good idea to match your colors with your banners, you use Hextech Amumu banners so a gold-ish color would probably suit your tables better than the bright yellow that is used now.