Olaf

Innate: Olaf gains bonus attack speed and life steal based on his missing health, up to 50+(50/17)*(x-1)*(0.7025+0.0175*(x-1))% bonus attack speed and 8+(17/17)*(x-1)*(0.7025+0.0175*(x-1))% life steal at 70% missing health.

Active: Olaf throws an axe to the target location that deals physical damage to enemies it passes through and slows them for type=distance traveled% seconds. Enemy champions hit are also inflicted with 20% armor reduction for 4 seconds.

Undertow deals bonus physical damage against monsters.

The axe remains in place for a duration equal to Undertow's cooldown, briefly granting sight of its surroundings. Olaf can pick up the axe to reduce Undertow's current cooldown to 2.5 seconds, which resets the cooldown if that has already elapsed.

Active: Olaf gains bonus attack speed for 5 seconds.

He also grants himself a shield for 2.5 seconds with an amount that is capped at 70% missing health.

Tough It Out basic attack reset Olaf's basic attack timer.

Active: Olaf strikes thunder onto the target enemy, dealing true damage.

If Reckless Swing kills the target, Olaf heals himself equal to the health cost.

Basic attacks reduce Reckless Swing's cooldown by 1 second, increased to 2 against monsters.

Passive: Olaf gains bonus armor and bonus magic resistance.

Active: Olaf becomes enraged for 3 seconds, cleanse himself of all crowd control and becoming Cc-immune, as well as gaining bonus attack damage and 10% increased size. For the first second of Ragnarok, he also gains bonus movement speed while facing sight enemy champions within 2000 units.

Ragnarok's duration is increased by and up to 2.5 seconds for each basic attack on-hit or cast of Reckless Swing against an enemy champion.