"You've done well to come this far. Now you must face your worst nightmare. Revive! All 6 Dragons!! Fuse into Omnipotenshydra!" - Black Crisis
Omnipotenshydra is the final boss in the game. It is a fusion of all the 6 dragons. It has 6 heads, all the same as the 6 dragons, and has ALL of their powers combined. His name means "All-Powerful Hydra".
PRIZE: Book of All Magic
Black Wyvvern - Omnipotenshydra