Delaphene is a Greater Demon who works with her sibling Christoph — deceptive, strategic, and proof that demons can be more dangerous working together.
Belphegor is an ancient Demon Lord pursuing something hidden in Ravens Peak — a near-unstoppable force moving through human vessels toward an unknown goal.
Frieda Gotlieb commands Hunter operations for the Council of Chaldea — the woman who freed Arthur from prison and refuses to let the organization fall.
Abigail is Arthur's adopted daughter — a deadly, precise hunter who carries questions about herself that the series spends three books slowly answering.