Unstoppable speedy ganks and snowball potential.
Burst damage and target access
Add an active effect to your boots that grants a large boost of MS and causes your next attack or spell to deal bonus adaptive damage.
Deals bonus true damage to enemies with impaired movement or actions.
Takedowns on enemy wards cause friendly Zombie Wards to sprout from their corpses. In addition, damaging a champion after destroying a ward inflicts bonus magic damage.
Unique takedowns grant permanent Active Item CDR (includes Trinkets).
Improved attacks and sustained damage
Shortly after using your Ultimate, gain a decaying Movement Speed increase that lasts for 3s and allows you to pass through units.
Gain MS and AP or AD, Adaptive when in the river.
+9% Attack Speed
+6 AD or 10 AP
Predator on Olaf allows you to hit the go button on ganks and not let up. With the CC immunity from [R] you'll be hunting down anyone who gets in your way.
Cheap Shot allows your to repeatedly deal True Damage to whatever target your attacking thanks to the perma-slow from [Q] and Righteous Glory.
Zombie Ward on jungler provides massive amount of vision thank to your natural deep warding to keep track of the enemy jungler, as well as clearing of enemy wards with Sweeper/Control Wards.
The item CDR from Ingenious Hunter allows you way more uses of Predator and Righteous Glory for those unstoppable ganks.
Nimbus Cloak's burst of Movement Speed synergizes well with Olaf's [R] playstyle when looking to chase down a target.
Waterwalking's jungle control power and mobility is huge for contesting crabs and dragons.