Saruin

Saruin is a God from Romancing Saga: Minstrel Song and Romancing SaGa.

He is the brother of Death and Schirach. Saruin Is sealed by the Fatestones in Queitus, which lies beneath the Isthmus. Saruin and his siblings sought to conquer the world of Mardias. Saruin is one of the most powerful Gods he created many beings to aid him in the destruction of the world and Elore. He created many powerful monsters the most notable were the Four Elemental Lords whose powers rival those of the Gods. His first creation was Pyrix, lord of flame, Adyllis, ruler of earth, Strom, serpent of water and Avi, master of wind. He bas betrayed by the Four Elemental Lords hey refuse to aid him in his cause, he then created a Fatestone and placed it inside another of his creation the Jewel Beast. The Jewel Beast consumed the Fatestone and went mad and attacked serously wounding Saruin. He then sealed the beast in the Frontier. Saruin created his most dangerous monster Soulgutter an undead monster with no soul that consumes the souls of all living things. Death could not allow his brothers creation to defile the souls of the living. because Soulgutter had no soul it could not be killed only seald. Death gave the mortals a Rite to seal the creature with the aid of the Giants an Altar was created to contain Soulgutter. Unsucessful with all his former creactions he then created a large an army of lizzards that he brought up from the, ground the Gecklings which he tought to walk upright and how to fight aided him in fight against the other Gods. He fought Mirsa and was sealed by the Fatestone that Elore gave to Mirsa and his companions.

Ultimate Boss
The player (after beating the game once at least), can offer up FateStones on the alter in Quietus to make Saruin stronger, with enough Fatestones he becomes the strongest boss in the whole game.

9 Fatestone Saruin: Part 1, Part 2, Part 3.

10 Fatestone Saruin: Part 1, Part 2.