Saiva is the Goddess of Destruction who fought the first War of the Gods in Mardias. She is only mentioned in the Romancing SaGa Ultimania.
There were many Gods in Mardias, Two stood out from the Rest however, Marda the creator, and Saiva the Goddess of Destruction, the 2 were at a stalemate, both used monsters and other beings as pawns for their battles. Saiva decided to turn the tides by creating a God of her own, she channeled a strong amount of magical energy to her finger and pricked it with a needle. From her wound, Elore was born, however Elore turned against Saiva and sided with Marda, eventually leading to her defeat
Upon her defeat, Saiva's remains broke up into 3 parts which became Gods themselves. From her bones arose Death, from her hair Schirach, and from her black heart Saruin.