Minecraft wiki entry for Warden, associated text: Wardens are blind and wander randomly, even through rails. The warden's hitbox can fit inside a corridor 1 block wide and 3 blocks tall. This allows them to chase foes pathfinding precisely even in small cave corridors. Wardens are immune to knockback and to damage from fire and lava. Water does not slow down a warden and a bubble column has no effect on an aggravated warden. A nearby vibration agitates the warden, which moves toward the location where the vibration originated. It can also smell the area around it, allowing it to zero in on an entity's location. The more vibrations a mob or player makes, the more agitated it grows.