Rahab is the second secret boss in Circle of Blood. She, unlike the serpent of the same name, is an ice elemental.
Rahab will teleport around the room, like Ignis. She can shoot diamonds, and attempt to freeze the player with shockwaves or ice beams. Later, she has a sword attack, a spinning arm-blade attack, and an attack where several ice spikes emerge from her body. She has 4000 HP, and her theme is Elemental Tactician.