Will o' the Wisp
Will o' the Wisp is an enemy in UnderMine which is spawned by Unsealed Urn. Upon getting caught by 3 of these, the player will recive a random minor Curse and some damage. Any Will o' the Wisp left on the player will disappear when going down a floor or after some time has passed.
They do not count as enemies and do not have to be defeated in order to clear the Room. However, they will stay in the room when the player returns. They cannot activate traps. These can be farmed to stack Curses if the player wants so and has enough HP.