The Drunken Lizard Pub

Thanks all of you for the help, especially Dragon Lady.

How about another spoiler hint--I step on the floor and nothing happens but I can see a passage beyond blocked by the wall. What's the secret?

They are to the south-east of Blackwater. One map east (or two), then one south, IIRC. Here's a map showing where their hideout cave is located.

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I've explored everything I can on level one. How do you get to level two of the tower?