Go to temple district and get approached by a priest (helm, lathandar, whatever) and he asks you to investigate the unseeing eye. go into sewers. go to upper left to enter unseeing eye area. go south, then west. see the leader and two guards. the leader gives you a key. go back towards entrance to find a locked door. unlock and enter to find a room with a tomb and a blind man(ex follower of the unseeing eye). he asks you to get the piece of rod. go down stairs and get it (to get it you have to fight a monster that can only be killed by healing it.) when you go back up stairs, the blind man is gone.
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"I'm sorry, did I kill you?"