
Passive
Spiked Shell
Rammus gains bonus Attack Damage scaling with his Armor and Magic Resistance.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Rammus gains bonus Attack Damage scaling with his Armor and Magic Resistance.

Q
Rammus accelerates in a ball towards his enemies, dealing damage and slowing targets affected by the impact.
Base values from ability rank 1 upward.

W
Rammus goes into a defensive formation, vastly increasing his Armor and Magic Resistance, and returning damage to enemies that attack him.
Base values from ability rank 1 upward.

E
Rammus taunts an enemy champion or monster into a reckless assault against him.
Base values from ability rank 1 upward.

R
Rammus hops into the air and slams down at a target area, dealing magic damage and slowing enemies. If cast while Rammus is in Powerball, Rammus knocks up enemies near the center as well.
Base values from ability rank 1 upward.