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.

Unit collision is governed by and fairly synonymous to the unit's pathfinding radius.

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. Baron Nashor is also immune.

Most dashes and blinks do not respect unit collision in their path or destination location.

Ignoring unit collision[]

Champion abilities[]

All abilities with stealth grant ghosting when not being revealed.

Items[]

• Mercurial Scimitar
• Phantom Dancer
• Youmuu's Ghostblade

Summoner spells[]

• Ghost

Runes[]

• Nimbus Cloak