These monsters served the Dark Entity and anyone who works for the Dark Entity.
After Jeremy began to play the Symphony of Destruction, the Bat-like-Things began to appear where Jeremy went and terrorized humans. He sent them ahead to New York City as his emissaries.
During the encounters with them, the Ghostbusters didn't have a way to deal with them, and ultimately they vanished after Jeremy turned on the Dark Entity with the Song of Life.
Powers and Abilities
These entities work on a different frequency than standard ghosts and have no ectoplasm. They can fly and are intangible, but they are able to physically smash objects.
- They do not seem be ghosts as stated by Egon Spengler and Ray Stantz. Proton Streams go right through them.
- Jeremy refers to them as "emissaries".