Bring 10 Highperch Venom Sacs to Fiora Longears in Theramore.
As you may know, wyverns are often tamed by orcs for use as mounts. But what is less known is that the venom of a wyvern, in some circles, is more valuable than the beast itself. So if you're not afraid to do a little wyvern hunting, then... I have a job for you.
There is a place called Highperch in the land of a Thousand Needles, west of here. The Highperch wyverns have a potent venom. Potent, and valuable.