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Ring of Shadows
Ring of Shadows
Uncommon
Pass Without TraceClass Actions
For some, darkness is wielded like a black opal stud embedded in a signet ring - fashioned to a sharp and unforgiving point.
Location - Ring of Shadows
Acquired at the Ruined Battlefield by completing the quest "Hide and Seek", which is given by 
Oliver.
Discussion
Act Two: Hide and Seek quest reward by Oliver, House with Flowers in Shadow-Cursed Lands. Can also be obtained by knocking him out or through pick-pocketingat the exact moment the encounter becomes a tactical turn based encounter and before he vanishes or if you can see invisible creatures. Pick-pocketing him does not seem to change how he interacts with the player.