The Fulcrum Star was a power source for an Obsidian Eye. It is a black hole frozen in crystal. The Zoni leader gave one to Angstrom Darkwater so that he could contact them. Later Ratchet found it hidden in Darkwater Cove, then used the Obsidian Eye in Hoolefar Island to locate Clank. Captain Darkwater and Rusty Pete both said it was worth a fortune.