Gudoul was a monster ka, residing in the soul of a man taken prisoner during the ka hunt. When taken captive, it was a small weak ka.
Gebelk discovered that he could quickly increase the strength of such ka by forcing the wielders to struggle for survival. As such he had ten criminals, including Godoul's host engage in a battle, where only one wielder could leave the arena alive. After 34 hours of on and off battling, Gudoul and Five-Eyed Horned Ogre were the only surviving ka and had significantly grown in strength.
The battle was interrupted, when Gebelk and Akhenaden hoped to test Kisara and her ka, The White Dragon. When Kisara was put in the arena, the prisoners focused their ka on her. Seto intervened and had his ka, Duos, cut the arena's suspension chains, causing Five-Eyed Horned Ogre and its host to fall to their deaths. Gudoul saved itself and its host by spinning webs to support them. It spun another web to tie up Duos and prepared to attack Seto and Kisara. However The White Dragon appeared  and destroyed Gudoul and its host with a blast of lightning.