PLEASE NOTE! THIS BUILD IS OUTDATED! IT WILL(EVENTUALLY) BE UPDATED! WILL INCLUDE: TANK AND JUNGLER BUILD AND GUIDES! TANK YOU VERY MUCH!

Hi! This is my first build, and I decided to share it because it is different than any I'm seeing on here.

Amumu is a fun character to play, and is very flexible as a character as he can fit different roles. He plays as a tank very well, absorbing damage in team fights and snaring many people at once, making him more than capable of turning the tide of any team fight.

As a mage, a little AP goes a long way for him. Someone might play him as a mage if they want a little more bang on his offensive spells. He stacks AP 1 to 1 on his Q and his ult, making him have a very good amount of burst damage.

He initiates very well in both roles, and is immensely durable. His W brings down any tanky dps you may find trying to solo you as you burst them down. This is a build for a tanky AP Amumu; I at first started out building tank, but decided I wanted to stop being ignored and get some kills of my own.

Pros!
-Great Ap ratios
-Durable
-Great stun
-Fantastic ult in team fights
-Anti-tank skill

Cons!
-His stun has bad cooldown in the early game
-Mana fiend(as most characters are early game), but Amumu is especially, even late game.

The mummy's innate may not look like much, but getting in an auto attack helps maximize damage at all stages of the game.
Amumu's stun is very long range, and is great for initiation into team fights. Early game harassment with this skill and a quick follow up auto attack with a Tantrum will have them running. This is your main mana hog spell; it isn't cheap, costing 80 at level 1 and increasing by 10 each level. You can use it to escape through neutral camps, but the cooldown on this spell hurts you early game; 18 seconds is a long time to wait for a stun, and you should hold off on harassment until about level 2, when you can follow up with a Tantrum.
Amumu's toggle spell is too ineffective early game to upgrade; it's only very effective against enemies with a lot of health, and unless you like jungling you won't find much use for it until late game, where it really shines. Combining this with a Rylai's Crystal Sceptorand running through a team fight is hilariously effective; you just slowed their whole team for 10 mana a second. It's also useful against slowing down those pesky creeps if they're heading right for your vulnerable tower.
Despair is your lovable spammable spell that is relatively cheap mana-wise that helps in farming creeps that are targeting you. Its passive ability gives you reduced damage, and its cooldown reduction turns a dps champ on their head, as you turn their speed against them.
This is Amumu's most amazing feature; a snare that can turn the tide of any team fight, help you escape ganks, deal great damage to anyone around you, and stop any dive in its tracks. This spell turns you into a wrecking machine in a team fight. It stacks AP 1-1, meaning you can deal upwards of 400 damage to everyone unlucky enough to be caught near you, not to mention snaring them for the rest your hungry dps team.

At the start, getting a Regrowth Pendantand a mana potion helps you lane to level 6, but until then you should not harass too much. Amumu is a mana hungry character, and although MP5 runes help, you won't be able to spam your Tantrum on creeps with wild abandon.

Building Philosopher's Stoneis what lets you lane for days, and is very helpful in dealing with harassing characters; you can sit back and gain back your health and mana while their Zilean glares at you from across the lane with no mana.

Reveriecomes after you get your Boots of Swiftness; it provides much needed health and cooldown reduction as well as great mp regen, and voila! your early laning problems are solved. This gives you a ghost ability, making you a speedy mother! Combining this with your ult stops any pitiful ganks they throw your way.

Getting Rod of Agesearly ensures maximum growths, and gives you plenty of AP, health, and mana, all very useful. There isn't much justification needed for this item. It's what starts you down the road to tanky AP.

Rylai'sgives you two slows, and makes you a beast in team fights. Much needed AP and health are included, and making you a crying slow machine on tiny bandage wrapped feet.

The item spot, Abyssal Sceptoris recommended to be filled with something to spec; Thornmailfor any physical team's carries that are running amok with Madred's Bloodrazors, and, if you really need to, go ahead and sell your Sherelya's Reverie to get a Warmog's Armorto make you insurmountable to any upstart Gangplank who shoots you with his funny little gun. If you're having trouble with any Magic heavy teams, getting a Banshee's Veiland Abyssal Sceptor is still recommended. But you can drop the Abyssal Sceptor for a Quicksilver Sashif you're facing any CC heavy team; let them pile it on, then shrug it off like it was nothing.

I chose two very versatile and useful spells to be used with Amumu:
YES!
FlashWhen the hell is this not going to be useful? Whether you're saving your skin, jumping right into a team fight for a tasty ult, or getting in range for a stun when someone is fleeing you and your team.
And:

ExhaustThis spell makes you impossible to solo late game, turns the tide in a 2v2 fight to get first blood, and is generally helpful in taking any of their carries out of the fight in a team battle. I'm thinking about changing this one for Clarity, just to let you know.

THE MAYBES!
Useful, but better left for someone like Gangplank or Nocturne, or some support character.
Much needed early game! But Amumu is no Zilean- He doesn't gobble mana throughout the whole game, and Reverie and a Golem buff help to remove this problem, and this spell may fall by the wayside, becoming largely ineffective.
A good choice for Amumu, who's always running into the middle of things. This helps you eat up their CC, but if that's really going to be a problem, just get a Quicksilver Sash.
If you're a big team player, go for it!
Not a bad choice, but not the best one either. Helps get to your team when they need your help, but it's not much help early game when you should be laning for plenty long.

THE HELL NO'S!
Honestly, if you have Reverie's active on a much shorter cooldown that makes you move faster, this is a waste of a spot.
This is useless when you have so much health late game.
No
Q: Why in the hell did Riot make this? A: To make me waste my time looking at it and to point out idiots who use it
NEIN NEIN NEIN NEIN NEIN!
Does this look like a jungling build to you?

Wow! That was a lot of information. So let's WRAP(Sorry, I'm ashamed) this up. This Amumu features everything you could want in a mage, but your team will thank you for tanking. Amumu has just passed Gangplank as my favorite character, because I don't have to get fed to roll faces. It's a good build at all stages of the game, and it is a versatile build for any team you may face.

Well, we're done with the build! Thanks for reading, and here's something for your troubles:

Amumu
With his bandages he ties
Running 'round with Rylai's
Smashing with his Haunting Guise
He's a tank droppin'
Gank stoppin'
Machination
Taking our team right to the win
He stacks AP like he stacks paper;
Straight to the ceilin'.