Irelia Ability (LoL): Ionian Fervor

Irelia gains a stack for 6 seconds when she hits an enemy with an ability (for a maximum of 4). She gains 7.5-20% attack speed per stack and at max stacks her attacks deal an additional 10-61 (+0.2 per bonus attack damage) magic damage (depending on level).

Attacking a champion or large monster refreshes the duration of the stacks. Irelia gains one stack per champion hit and one stack for hitting minions.