Mound of the Sleepless

In the blighted Aerilpar Forest, there is a grassy hill known as the Mound of the Sleepless. No trees grow on it and no monsters dare approach it. Rumour has it that beneath the bound is a labyrinthine series of tunnels where time and space seem to twist and curve. The tunnels are said to be inhabited by umber hulks, thri-kreen, ankhegs and other bug-like creatures. These creatures serve Kharapaiz, a chitinous beholder prince, who dwells in the deepest parts of the labyrinth, guarding an artefact of unimaginable power.