Do not touch the block of stone! It will DT you! Just track through the sea of tranquility and you won't have to pay. Most of the locked doors are impervious to pick/knock.
The most notable mob is B'rakkum.
Walk ( 6n, 3nw, w, n, 4e, s, w, sw, nw, n, ne, u, 2ne, u, ne, u, ne, nw, w, u, 2ne, u, w, u, ne, se, 2e, 2se, e, d, ne ) to get from DH to the room marked in blue.