- "I knew your mother both before and after the Change took her. She was ugly before and, let me tell you, there was little difference afterward. Your mother was so ugly that even magic mirrors would not talk to her. Your mother was so ugly, she-"
- — Hel, taunting the Sphinx about her mother
|Age (Circ. 2012)||Unknown|
|Born||At least 10,000 years ago|
|Status (Circ. 2012)||Unknown|
|Aura Color||Unknown edit|
|Aura Scent||Unknown edit|
|Relationships and Family|
|Children||The Sphinx, The Hydra, Cerberus, The Chimera, all Gorgons|
Like most Elders, Echidna's once-humanoid appearance took on animal-like qualities as she aged in a process called the Change. She grew a long serpentine tail, draconic wings, and her hair transformed into a writhing mass of living, venomous snakes (similar to a Gorgon).
- An echidna is an unusual egg-laying mammal, similar in appearance to an anteater, that shares a common ancestor with the modern platupus. The animal is named after the Greek depiction of Echidna, since the animal has both mammal-like and reptile-like traits.
- Hel noted to the Sphinx that Echidna was hideous even before the Change.