Chaos was the cat of the owner of Festeron's Ye Olde Magick Shoppe. It was all black save a white spot on its forehead.
It was kidnapped by The Evil One as a part of her plan to control Wishbringer, the Stone of Dreams. To do this, Chaos was turned intoa stone sculpture, and the only way to bring the cat back to life was to insert Wishbringer into the sculpture's forehead.
A heroic Festeron postal employee accomplished this task, managed to resist The Evil One, and returned Chaos to its rightful owner.