
Passive
Ionian Fervor
When Irelia strikes enemies with spells she gains stacking bonus Attack Speed. At maximum stacks she also gains bonus damage on hit.

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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
When Irelia strikes enemies with spells she gains stacking bonus Attack Speed. At maximum stacks she also gains bonus damage on hit.

Q
Irelia dashes forward to strike her target, healing herself. If the target is Marked or dies to Bladesurge, its cooldown refreshes.
Base values from ability rank 1 upward.

W
Irelia charges a strike that deals more damage as she charges. She takes reduced physical damage during the charge.
Base values from ability rank 1 upward.

E
Irelia sends out two blades which converge on each other. Enemies caught in between are damaged, stunned and Marked.
Base values from ability rank 1 upward.

R
Irelia fires a massive number of blades that explode outward upon hitting an enemy champion. Enemies hit by the blades are damaged and Marked. Afterwards the blades form a wall that will damage and slow enemies that walk through it.
Base values from ability rank 1 upward.