During the palace battle against Bakura, Seto disregarded Akhenaden's suggestion that the High Priests would need to combine their power to defeat Diabound, believing his power alone would to be sufficient. Seto raised a stone slab, which he used to summon Galestgoras from the Shrine of Wedju.
Galestgoras bit Diabound in the arm, managed to subdue the attack from its snake appendage and slam Diabound on the ground. As Galestgoras attempted to deliver its finishing blow, Diabound evaded by using its power to move freely through solid matter. Diabound then made its way into the tablet Galestgoras was summoned from and destroyed it, causing Galestgoras to disappear.