Slay 7 Slitherblade Myrmidon, 7 Slitherblade Naga, and 5 Slitherblade Sorceresses, and then talk to Drulzegar at Shadowprey in Desolace.
Maybe you heard or maybe you haven't... my crew and I was out fishing near Ranazjar Isle, north of the wrecked ship off the coast up north. We used to fish there all the time; now all I do is think of a way to seek revenge for my fallen comrades.
The naga attacked us one morning, killing everyone except me.
Me conscience can't handle the guilt, [class]; I need you to go and fry them naga for me. I'll make the effort worth your while; you think you can help me with that?