Rammus' basic attacks deal bonus magic damage, scaling with his Armor.
Q - Powerball
Rammus accelerates in a ball towards his enemies, dealing damage and slowing targets affected by the impact.
W - Defensive Ball Curl
Rammus goes into a defensive formation, vastly increasing his Armor and Magic Resistance, amplifying Spiked Shells' damage, and returning damage to enemies that basic attack him, but he is also slowed during this time.
E - Frenzying Taunt
Rammus taunts an enemy champion or monster into a reckless assault against him. Additionally, he gains increased Attack Speed for a short time, but this bonus is extended by having any of his other spells active.
R - Tremors
Rammus creates waves of destruction pulsing through the ground, causing damage to nearby enemies and slowing them. Turrets take double damage from Tremors.