Possessing the mutant powers of superhuman senses and hunting skills, Callisto was once the leader of the Morlocks, a society of mutant outcasts living in the forgotten tunnels beneath Manhattan. After a falling-out with her followers, Callisto helped destroy the Morlocks but died in an avalanche shortly after.

noun

Greek & Roman Mythology - a nymph [any of a group of minor nature goddesses, represented as young and beautiful and living in rivers, mountains, or trees] loved by Zeus and changed into a bear by Hera, and later killed by Artemis

mutant