Rammus receives bonus attack damage equal to 25% of his total armor.
Powerball
Cooldown: 10
Cost: 70 / 80 / 90 / 100 / 110 mana
Active: Rammus enters a rolling ball state for up to 7 seconds, constantly accelerating from an initial bonus 3% move speed up to a bonus 165% move speed. While in this state, Rammus cannot attack or use Puncturing Taunt. Casting Powerball again during its duration will end it instantly.
Upon impacting with an enemy unit, Rammus will knock back all nearby enemies, dealing magic damage. Additionally, enemies affected by the impact will be slowed for 3 seconds.
Powerball will end if Defensive Ball Curl is activated during its duration.
Active: Rammus enters a defensive stance for 6 seconds, significantly increasing his armor and magic resistance and returning magic damage to enemies whenever they use a basic attack against him.
Defensive Ball Curl will end if Powerball is activated during its duration.
Active: Rammus taunts a target monster or enemy champion, reducing their armor and forcing them to attack Rammus for a few seconds.
Armor Reduction: 10 / 15 / 20 / 25 / 30
Duration: 1 / 1.5 / 2 / 2.5 / 3
Tremors
Cooldown: 60
Cost: 120 mana
Active: Rammus creates tremors beneath him for 8 seconds dealing magic damage to nearby units and structures each second. Rammus can move, attack and use other abilities while Tremors is in effect.
3150 or 
790
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