hey guys/girls this is my guide for amumu that i wanted to share. this guide was built on what i found best for amumu while playing him either normal and ranked. i love playing this champion he is strong from being a natural tank, can give out great damage, can jungle and even suprise one or two players on how strong he is, ive taken afew scalps with this guy including the likes of darius, xin zhao, malphite, volibear and many more (some with full health some just in general team fights) this guy can do anythink he wants hes a great all round champion and can take a serious amount of damage and also give it out too. he my sound like that all hes wants is a friend but he will be your worst enemy at the end of a game with this build.
all types of feedback is welcome and i will be updating depending on changes due to a new patch and new champ's

sunfire cape:

amazing with amumu combined with his W ability, standing near enemy champions drains health away and using other abilities then you will be giving out a serious amount of damage while taken alot too from being naturally tanky

rabadons deathcap:

this is a game changer for amumu, as with all AP champs this makes your damage output rocket up, with amumu this gives you an amazing amount of damage for a tank and makes his ultimate change team fights and gives you the upper hand if you was on the brink of losing the fight. this add's that extra edge to be able to give a great damage output to stand up to alot of the champions out there and come out on top

Pro's:
great survivability
great AOE for a tank
good damage output for a tank
can change team fights with his ulti
can close gaps between champs well with his Q
a scary undead child O.o
take an unreal amount of damage (even for a tank)

Con's:
no escape mech
struggles in the jungle against other junglers etc shaco, diana, skarner
highly dependable on team-mates
Q is hard to hit when the enemy is behind minions (difficult to harass)
mana hungry early game