Humbaba

Humbaba is the legendary lost dragon of Mesopotamia, an anxient relic that was said to be cursed.

History
Humbaba was left in a hidden underground tunnel where it remained for hundreds of years. Both Salvatore and Adriano Landucci went after it but Adriano disappeared. After going to Niccolo Machiavelli for help, Salvatore met Leonardo da Vinci who, after solving a series of complex puzzles and clues, found the entrance to the tunnel and recovered the dragon. However Salvatore dropped the robe, leaving Leo stuck with his brother, Adriano, who was revealed to be have been stuck in the tunnel, surviving off insects. Sensing something wasn't right, Mac made up a story, telling Salvatore there were two dragons, and that Humbaba had a brother named Chim-hoho, and that both dragons would make its owner the wealthiest person on Earth. Upon returning to the tunnel, Salvatore was confronted by his brother, both fighting over the dragon. Meanwhile, Leo was rescued by Mac and Lisa. Later, the two brothers were still seen to be stuck in the tunnel and arguing over who would get to climb the rope first, showing that the dragon may have been cursed after all, (Dragon Hunt)