Zagreus Materia, also known as Zagreus's Materia or Zagreus's Prison, was a powerful Summon Materia created by Minerva to contain the Consciousness, powers and memories/knowledge of the extraterrestrial life-form called Zagreus. Zagreus at some point battled Minerva who managed to trick Pegasus into battling on her side, Pegasus being the only individual to have damaged Zagreus's body in one-on-one combat, even with the Cetra on her side the war was close and Minerva lost much of her power before she managed to seal both the defeated Zagreus and unconscious Pegasus away.