i try to give olaf the most survivability with the 3 first item.
after getting those 3 u will be able to tank and ull make HUGE damage with ur reckless swing.
Berserker Rage (Innate): For each 1% of health missing, Olaf's attack speed is increased by 1%.
Ability Description Levelling up
Undertow (Active): Olaf throws an axe into the ground at a target location, dealing damage to units it passes through and slowing their movement speed for 2.5 seconds. If Olaf picks up the axe, the ability's cooldown is reduced by 6 seconds. Damage: 65/110/165/200/245 + 30% of Attack Damage
Vicious Strikes (Active): Olaf's attack damage is increased, based on his health, and he gains massive lifesteal and spell vamp. Damage: 12/18/24/30/36 (+ 0.4/0.7/1/1.3/1.6% of Max Hp)
Lifesteal: 9/12/15/18/21% Spellvamp: 9/12/15/18/21%
Reckless Swing (Active): Olaf attacks with such force that it deals true damage to his target and himself. Damage: 100/160/220/280/340
Ragnarok (Active): Olaf gains bonus armor penetration, is immune to disables and reduces incoming damage by a flat amount for some time.
Duration: 5/6.5/8 seconds
Armor Penetration: 15/25/35
Flat Damage Absorption:25/45/65 flat damage absorption.
last game played 22/1/2
gg with the most dps tank of the game
good luck have fun
works great in 3v3 also, maybe more than in 5v5 but rape in 5v5 too.