The Diamond Star, like the other Crystal Stars, was created by the Shadow Queen as powerful objects she could use to rule the world. It somehow ended up in Hooktail Castle, and the rumor of Hooktail guarding a fabulous treasure began to spread. Many adventurers and treasure-seekers, including Koopley and Professor Kolorado's father, left to look for the trasure, but all were defeated by the Dull Bones or Hooktail herself. Professor Kolorado's father was defeated in the hallways, presumably by the Dull Bones, while Koopley was actually swallowed alive by Hooktail. Later, in his quest for the Crystal Stars, the location of the Star was revealed to Mario, and he set out to find it. He passed all obstacles in his way, and successfully defeated Hooktail. She then coughed up Koopley, who had fou