Rarkun and Durothil perished to the hands of Kir'anis, indirectly and directly.

Through careful tongue, Riff was able to negotiate the release and revival of Rarkun and Durothil, in exchange for a loose deal; the retrieval of one hundred yuan-ti heads.

He sent you on your way, with the aid of Fleebo, who led you to the Gatestorm of Ashtakala.