Grim Campfire is essentially a far more eerie and super-cool version of the Basic Campfire. When used, the Grim Campfire item produces an ominously decorative pile of skull and bone, ablaze with a purplish flame.
Grim Campfire can be used as a cooking fire, but it does not boost anyone's spirit. It does, however, look very awesome.
The Grim Campfire is useable by characters of any level and has a 5 minute cooldown - the same as the Basic Campfire. It alo has unlimited uses, so it essentially becomes a new type of fire you learn how to build.