Larian Studios Forums Divine Divinity (English) General sewers help

I am trying to re-enter stormfist, but cant. Ive tryed sewers, and got to treasure room, became a thieves guild member and now stairs to castle treasure room are locked and lockpick doesnt work.
also, in the sewers under merchants area, there is a small building on mini map in the center of water on the north end of map, in between the 2 pipe entrances and torure chamber. What is it, is it important?

To get back into Stormfist castle after being kicked out you can either toss a teleporter stone into the courtyard to teleport past the guards, or run in and immediately after being stopped, click inside the castle (they will not be fast enough to stop you a second time).

Here is a map of the Rivertown sewers. Are you referring to the building straight south of the prison entrance? You can not get there except by maybe tossing a teleporter stone or hex editing, so it is just there for background / atmosphere.