BRITAIN SEWERS

Where: In the sewers below Britain.

Visit: At the sign near the area with the switches at the North West end of the Britain sewers, you can enter this secret dungeon area by speaking "charvory" at the side of the sign near the switches in the screenshot.

SPECTRE DUNGEON

Where: On the island of Reg Volom in Ilshenar.

Visit: Run from Spirituality Shrine to the Spider Cave. Run through Spider cave until you get to the teleporter just outside the exit. Once in Reg Volom enter Spectre Dungeon and at the tip of the sword pattern in the hallway past the first room - speak "masteropenthydoor" to enter the secret tomb room below.