Wisp is an entity that can appear in The Lost Floors.
Appearance
Wisp resembles a skull with eyes and a wide, open mouth. Its eyes appear to be weeping a black substance.
Behavior
When Wisp spawns, the lights flicker and it appears a few rooms behind the last opened door, before rushing toward the nearest correct closed door—disappearing once it reaches it. However, unlike other rushers, Wisp is harmless.
If you hide while Wisp is passing by, your screen will glitch.