Unit collision (also commonly known as Creepblock) refers to the mechanic by which a unit will always attempt to not occupy the same region as another unit in a game of League of Legends. Champions, minions and monsters are all affected by this.
For other types of unit radii, see: Unit radius
Unit collision is invalidated by ghosting, which is a status effect that disables collision from a unit, giving itself and other units the ability to move through each other without interference; it allows a unit to intersect with another unit's pathing radius. It often comes with a movement speed buff. Champion ability-created terrain consists of units which are immune to ghosting. is also immune.