Pathfinder

Pathfinder - enemy in Marrow.

Description
Pathfinders are levitating creatures that look a bit like flying brains with hands and two red eyes. Once they notice the Daniel, they'll keep chase him until death (no matter whose), but it's also possible to run away from them on a long distance so they'll stop.

Can be invisible in some locations, so you need to light torches or use the Luminous Orb.

Trivia
* They also appear as enemies in Exoder.