From DivNull RPG
These demons are twisted and corrupt shadows of their creator, embodied in books. What’s more, they know they are flawed, that their only hope of being made whole is to bring a reader, the more powerful the better, home. They lack mobility and voice, but when their knowledge is inevitably accessed, most will introduce their reader to Gruidtsuru, one way or another. Others hate themselves and their maker, and will connect to another demon out of spite. Still others have been usurped and converted to serve other masters.