Ensnare is a star within the Constellation The Tower in Elder Scrolls Online (ESO).
This was added in Update 6 with the Champion System. It grants the player a 33% chance to reduce their target's movement speed by 20% by 3 seconds when using Bash. 10 points in the Tower Constellation are required to unlock it. Once unlocked the player will acquire this bonus automatically and across all characters on their account.