To enter this dungeon, give a Slip of Paper from the desk in the east building of the Ishilai Lyceum to Eaushi the Trainer. See Hieromancer's Armor for details. The training golem will portal you to one of several instances, so if another person comes in, it is unlikely they will go to the same dungeon. In the north side is a 350 pick chest with A Boot and Another Boot that can be combined to make Boots of the Vault.