Morgana is the leader of the nymphs in the story, Alice (Novelette).
She is also called "Lady of the Moon," derived from the ceremony when a new leader of a nymph tribe is chosen under a full moon. The name of their tribe is "Nymphs of Onryx."
Morgana is capable of doing magic, particularly putting plants under her control. In the story, she used her power to ensnare Janus by wrapping his arms, legs, body, and neck with vines when she found out he was seducing the nymphs into revealing the path to the witch's hut.