df5935a1__and_Guide___Page_77___GameSpy__Description
[Quest Name] Ream-Rot Knife [Starting Location] Sundermount Caverns [Description] 
The item of the same name is found from close to the eastern exit of the map. Faj in Lowtown will reward you for it.
Dragon Age II - ps3 - Walkthrough and Guide - Page 77 - GameSpy
Description