mother-of-monsters

Echidna

“In Greek mythology, Echidna is the "Mother of Monsters," a half-woman, half-serpent drakaina whose unions with Typhon produced the Hydra, Cerberus, the Chimera, and much of the era's monstrous brood.”

Ajatar

“In form, Ajatar is consistently pictured as an evil female being who manifests as a serpent or dragon, and she is specifically said to suckle snakes, nursing them as a mother would nurse young.”