[Rework Concept] Olaf, The Beserking Ragnarok
http://i.imgur.com/LdZHtrT.jpg
Passive - Berserker's Rage: Olaf has increased movement speed and attack speed the less health he has.
Q - Frigid Undertow: Olaf throws an axe to the target location dealing physical damage to all enemies it passes through and slowing them for a few seconds based on distance traveled. The axe remains at the target location until Frigid Undertow goes off cooldown, which can be reduced by half if Olaf retrieves the axe.
W - Chillblood Fury: Olaf unleashes a warcry, causing his enemy's blood to run cold for several seconds. For the duration, whenever Olaf damages an enemy who heard his warcry, he is healed for a portion of the damage that was dealt based on Olaf's missing health. Any crowed control effect that Olaf is effected by during Chillblood Fury, Olaf will place on his enemies with his next basic attack.
E - Reckless Strike: Olaf leans back for a moment before unleashing a devastating headbutt in a target direction, that deals true damage to Olaf, all enemies, and enemy towers hit. If Olaf hits terrain with it, he will temporarily destroy that terrain.
R - The Coming Ragnarok: Olaf enters an unstoppable rage as he draws closer to death. Olaf gains a shield based on his missing health for a few seconds. While the shield is active, Olaf is immune to crowed control effects.