A portal to this dungeon is found at the bottom of the Crater Lair. At the end of the dungeon is a portal to the Catacombs of Opposition where the parts and NPCs for the Olthoi Weapons Quest quest are found. On the ground in front of the Catacombs of Opposition portal you will find a Note from a Scout. The note can be turned in to the Royal Guard in Cragstone for 150,000 xp.