You either buy her in the cash shop, win her in an event (yes it was thought of as a prize) or get 900g + baphomet eye + killing bahomet.
gLunia main - SolSeaker - 6x dacy (very active)
gLunia sub - soluna - 5x tia (active)
gLunia sub - solunox - 5x lime (on the verge of death)
gLunia sub - solsti - 5x dainn (active)
gLunia sub - SolSavior - 5x sieg (active)
gLunia sub - Solunair - 4x eir (active)
gLunia Main - SolFreeze 6x yuki (very active)