Amumu's autoattacks reduce the target's magic resistance by 15 / 20 / 25 for 3 seconds. This debuff does not stack but it refreshes with every autoattack.
Bandage Toss
Range: 1100
Cooldown: 16 / 14 / 12 / 10 / 8
Cost: 80 / 90 / 100 / 110 / 120 Mana
Active: Amumu tosses a sticky bandage in a straight line towards a target location. Amumu will pull himself to the enemy it contacts, dealing magic damage and stunning the target for 1 second.
Toggle: While toggled on, Amumu is surrounded by a small pool of damaging tears. Enemies in the area take magic damage each second equal to a base amount plus a percentage of their maximum health.
Base Magic Damage Per Second: 8 / 12 / 16 / 20 / 24
Additional Damage Per Second: 1.5 / 1.8 / 2.1 / 2.4 / 2.7% (+ 1% per 100 AP)of enemies' maximum health
Tantrum
Range: 200
Cooldown: 10 / 9 / 8 / 7 / 6
Cost: 35 Mana
Passive: Amumu takes reduced physical damage from autoattacks and abilities.
Physical Damage Reduction: 2 / 4 / 6 / 8 / 10
Active: Amumu releases his anger, dealing magic damage to surrounding enemies. Each autoattack that hits Amumu will reduce the cooldown on Tantrum's active by 0.5 seconds.
1350 or 
585
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