Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Undertow - Olaf throws an axe into the ground at a target location, dealing damage to units it passes through and slowing their movement speed. If Olaf picks up the axe, the ability's cooldown is reduced by 6 seconds.
Olaf throws an axe to a target location, dealing 65/110/155/200/245 (+) magic damage to units it passes through and slowing them by 24/28/32/36/40% for 2.5 seconds.
If Olaf picks up the axe, the ability's cooldown is reduced by 6 seconds.
Cost 55/60/65/70/75 ManaRange 1000
Vicious Strikes - Olaf's attack damage is increased, based on his health, and he gains massive lifesteal and spell vamp.
For 6 seconds, Olaf's attack damage is increased by (12/18/24/30/36 base damage plus 0.3/0.6/0.9/1.2/1.5% of his max health). While active, Olaf gains 9/12/15/18/21% lifesteal and spell vamp.
Cost 40/45/50/55/60 ManaRange 700
Reckless Swing - Olaf attacks with such force that it deals true damage to his target and himself.
Olaf deals 100/160/220/280/340 true damage to his target and inflicts 40/64/88/112/136 true damage to himself.
Cost 50/50/50/50/50 ManaRange 325
Ragnarok - Olaf is immune to disables, has increased armor penetration and reduces incoming damage.
Active: For 5/6.5/8 seconds, Olaf is immune to disables and reduces incoming damage by 25/45/65. Passive: Olaf has 10/20/30 increased armor penetration.Cost 100/75/50 ManaRange 400
Berserker Rage - For each 1% of health missing, Olaf's attack speed is increased by 1%.
Olaf isn't a hard champion to master. I useually open fights with this spell combo: Vicious Strikes -> Reckless Swing -> Ragnarok -> Undertow (When they're trying to get away) and You'll want to throw Undertow so it just hits them, and stays colse to you so you can get it quickly to keep slowing them down and do Reckless Swing ASAP. If I'm fighting a champion with an annoying Ultimate, (Nunu, Amumu etc.) I save Ragnarok for when they cast it, so I can get out unharmed. That's pretty much all there is to Olaf, so remember to do work and have some fun :)
(in-game name: xFrEsHHx)