The Cleric

Description
One of the Champions that can invade the lair. To trigger her spawn, merge Bats, Snakes, and Shades.

Defeating her will grant a chest of Blood Runes. Alternatively, you can feed her to the Devourer for 250 Food.

Curiously, she seems to be the only Champion that can start dialogue three messages long; revealing the NecroMerger's distaste regarding cults.