To start this quest you should talk to Spirit of Baran Levere.
We encountered the spirit of Baran Levere. A Lone Wolf has assumed his identity, and now Levere wants revenge against the imposter.
The Merchant
Quest stages of The Merchant
1. Killed Baran
Kill Baran Levere.
We killed the imposter of Baran Levere.
2. End
The spirit of Baran Levere thanked us and departed for the Hall of Echoes.
3. Consumed Ghost
One of us consumed the Source of Baran Levere's spirit.
4. End RC
We have departed from Reaper's Coast without assisting the spirit of Baran Levere. His revenge will go unfulfilled - at least by us.
5. Start Over
We encountered the spirit of Baran Levere - the real one. It seems that an imposter had assumed his identity, but now he has been avenged.