Theodore couldn't help but read about Daeva, 'demon of darkness -- Shadow demons, and they're savage, animalistic, nasty attitudes -- kinda like demonic pit bulls. These daevas, they have to be summoned. Conjured.

Daevas are a powerful and unique type of demon that functions differently from most other demons. They do not need a vessel to walk the earthly plane, As from that, That can make them quite dangerous.

Invisibility - They are naturally invisible, and only their shadows can be seen, which they require to manifest.

Teleportation - They seem to be able to move from place to place like regular demons and can be summoned to appear and...