If the player recruited Odin before fighting Seifer at the top of Lunatic Pandora, Odin will attack at the beginning of the battle. Seifer will use "Zantetsuken Reverse" and slice Odin in half. Odin's sword creates a rift in space/time, from which Gilgamesh appears and picks it up. The battle continues as normal.
Later in the fight, if it has lasted for more than 12 rounds or the player depletes all of Seifer's HP, Gilgamesh will appear and defeat Seifer. Gilgamesh will join the player party and will appear at random during battles, just like Odin.
If the player doesn't have Odin when they reach the top of Lunatic Pandora, Gilgamesh cannot be recruited in that playthrough.
