The Stonecomb was the ever-shifting mass of interconnected tunnels within the Sanctaphrax rock. At its centre was the Heartrock. Glisters lived in large numbers within the labyrinth. The Stonecomb was also the lair of the Blood-Red Glister. Three tunnels had been constructed through the Stonecomb: the Sanctaphrax Tunnel, the Great Library Tunnel, and the West Tunnel.