Pac-Man also has four friendly ghosts (Blinky, Pinky, Inky and Clyde) that surrendered and vowed to help him along his voyage (in exchange for being restored to the living world). Pac-Man vows to stop Betrayus and the ghosts (or any other bad guy) from taking over Pac-World while searching for his long-lost parents. He has the unique ability to eat ghosts and destroy the ectoplasm that makes up most of their bodies. Only their eyeballs survive, which he spits out. They reform their bodies using a regeneration chamber.  The ghosts continually attack the city to locate the Repository, a storage chamber for the corporeal bodies of the ghosts which would allow them to live again if they possessed them.  It is kept hidden to deny them this freedom and only President Spheros and Pac-Man are aware of its location. The ghosts also attack the Tree of Life to prevent Pac-Man from gaining powers to fight them. Without the power-berries, Pac-Man is not able to fly, breathe in the Netherworld, or enjoy the taste of ghosts.