The 3rd daughter of the Original Dragon Fafnir, Echidna is the mother of some of the most legendary monsters to have roam this world, Apophis and The Prime Hydra, little is known other than than her affinity towards rot, and if spotted she's to be left alone, her last known location was strangely around the theorized spawning ground of the hivemind Aila.

She usually appears (in human form) as a thin white skinned woman, only covered by her tendrils around where her breasts would be, and her eyes being the true embodiments of her affinity. Her true form being only described as Shouldn't Be Possible, and has driven any survivors that witnessed it into insanity, though it is speculated that she herself deteriorated their mental state.