The Walking Host is a Monster in The Binding of Isaac: Rebirth that is commonly found on The Caves, The Catacombs, The Flooded Caves, The Depths, the Necropolis, and The Dank Depths floors. While the skull is over the red tissue, the Walking Host is invincible. If Isaac does not damage the Host for some time, its skull will raise up to fire a tri-shot wave at Isaac, exposing its vulnerable flesh. It can only take damage when its flesh is exposed. The Walking Host is unique because it slowly walks towards Isaac.