South part of the sewers? Just throw one of your tellies over the SOUTH gate, teleport yourself in - or use telekinesis for the chests, but you won't get the barrel then. There's a lizard mage in there.
Caution: How high is your spiritual resistance? Over 15 is safe: Polymorph bug when opening one chest: Croakcroak.
Kiya
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Don't tell I didn't warn you <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />... there's another one in these sewers: Bunny danger.