- "Strange sounds from the sewer are disturbing folk. Find out what's going on."
- —Written Request
Secret of the Sewer is the last solo mission you can take during the Human Path after you defeat the Fire Dragon. Once you pick the request up from Thanos head down to the sewers from the basement of Theater Vancoor.
Strange noises are heard from the sewer lately. Please investigate the area so we can lead our lives in peace.
You will need to complete this mission to recruit Genius Weissheit
If this is your last request, completion will also unlock Thanos.