Durk the Deranged seems like an unreliable source of 'secrets.' Perhaps this mission will prove uneventful.Descend into the Den of the Kobold Brothers from the Harbormaster's Plaza in the Harbor. In there, find out whether Durk's secret has any basis in reality.
Kill the first kobold brother while the second is away
Kill the second kobold brother while the first is away
(Optional) Eliminate the troglodyte henchmen - 2 total (10% of base XP)
(Optional) Eliminate the troglodyte shaman (15% of base XP)
(Optional) Open the rear section of the sewer (5% of base XP)
(Optional) Slay Muck (15% of base XP)
(Optional) Slay Witch Doctor Zizoo (15% of base XP)
(Optional) Slay Witch Doctor Rakhat (15% of base XP)