
Passive
Berserker Rage
Olaf gains Attack Speed and Life Steal based on his missing Health.

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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
Olaf gains Attack Speed and Life Steal based on his missing Health.

Q
Olaf throws an axe into the ground at a target location, dealing damage to enemies it passes through and reducing their Armor and Move Speed. If Olaf picks up the axe, the ability's cooldown is reset.
Base values from ability rank 1 upward.

W
Olaf's Attack Speed is increased and he gains a Shield.
Base values from ability rank 1 upward.

E
Olaf attacks with such force that it deals true damage to his target and himself, refunding the Health cost if he destroys the target.
Base values from ability rank 1 upward.

R
Olaf passively gains increased armor and magic resist. He can activate this ability to become immune to disables for as long as he keeps attacking.
Base values from ability rank 1 upward.