That's No Island. It's An Adventure!
The alleged hide out & base of operations for the Guild of Thieves. Most people speculate that they are filled with deadly traps which kill those foolish enough to enter unprepared. Few outside the Guild know the whereabouts of the rumored “entrance without traps”. There are known entrances in grids I2 & G5
So far during this adventure, four guards have been killed at the I2 entrance to the caves.