Willump rolls a snowball that grows in size and speed. The larger the snowball, the more damage it deals and the longer it knocks up.
When the snowball impacts a wall, enemy champion, or large monster, it explodes, dealing up to 180/225/270/315/360 (+150% bonus Ability Power) damage to nearby enemies and knocking them up.
Reactivating the ability rolls the snowball forward on a straight path.
Continuously turning in the same direction increases Willump's turn rate over time. This bonus starts over when changing turn direction.