Princess Ivy Bluemoon was the last of the Pegasus's. Pegasi? Pegasaurus? Whatever, that. She was the last one. She was magical, diabetic, and could fly. During the end of the Demon Apocalypse, the hero Jaela was made to chose between PIBM and Blood Drinker. She chose to sacrifice the sword to keep the Pegasus.
It is unknown where she came from. She arrived with Ros and The Coven during The Battle Above the Abyss.
She presumably currently resides in Deephome with Jaela and her queen wife Aludra Wyrmsbane. Last scene flying into battle with the two above Deephome against the mysterious Thom Vidalis.