The Chasm is a large hole created by Destroyers and Dwarves fighting underground. Enter this hole to get underground and get to areas in Guild Wars Eye of the North. This is also known as a Crevasse (Prophecies) or Fissure (Nightfall). You must have Eye of the North purchased on your account and be at least level 10 to enter these chasms. The chasm is also treated like an NPC.