Slay Mragesh and return to Zurjaya in Zabra'jin.
You've dealt with most of the little hydra, but I doubt Mragesh was impressed by your display. He's a cunning, ferocious beast and he's dogged many an angler in his time.
I intend to be the last one he'll ever bother. He's bound to be hiding deep in the waters of Serpent Lake, to the northeast. He's a has-been; he just doesn't know it yet.
I'm sure the old boy must've seen his days coming to an end. With all these new arrivals, the old order couldn't stand. It's just as well his spirit is at rest now.
You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain: