Possessed Block is a unique trap block that is found in the bottom level of the Wight Fortress. It disguises as Betweenstone Bricks to hide its position. When a player come within about a couple of blocks of its position, it will launch a screaming entity towards the direction the block is facing (usually towards the player) which emits particles. If the player touches this entity they will be damaged for 2 health () and be knocked back severely. The entity will retract after dealing said damage, only striking again after a cooldown of 10 seconds should the player continue to be close enough to the trap block. Do note if you try to mine it that it is protected by the fortress.