Spawns ghosts that drift to the ceiling and fade away
White, red, green and blue ghosts
DamnedSoulSpawner, DamnedSoulSpawnerRed, DamnedSoulSpawnerBlue, DamnedSoulSpawnerGreen, DamnedSoulSpawnerB, DamnedSoulSpawnerRedB, DamnedSoulSpawnerBlueB, DamnedSoulSpawnerGreenB
Doom, Captain Toenail
Doom3 Hell level
This rather gruesome thing spawns ghostly souls that drift towards the ceiling. As they travel they ripple and fade away. I was inspired by the Hell section of Doom3 where there are similar weird things.