This quest is not available in game.
Bring 2 Tough Scorpid Breastplates, 2 Tough Scorpid Gloves, and 10 Worn Dragonscales to Thorkaf Dragoneye in the Badlands.
Completing this quest will give you access to the Dragonscale Leatherworking arts.
The completion of this quest will prevent you from learning Elemental Leatherworking and Tribal Leatherworking; be sure this is the path you wish to follow before doing so.
Dragonscale leatherworking isn't easy, but it's extremely rewarding. I'll teach you how to make this fine mail armor, but only if you agree to certain conditions.
By choosing this path, you agree never to learn elemental or tribal leatherworking; there is only room for one of the three at the apex of the craft. Furthermore, I'll need some samples of your best work involving scorpid armor. Finally, I'll need proof of your ability to acquire the staple of the trade: scales of the dragonkin.