black dragonskin  you need a flint sword then go to the trainner with the red dragon. If you have the flint long sword, you give it to the trainner and he hands you a black dragonskin. Then take it to the old man on the same path. after you've gone to the gambler in the gambling house and played his game and  won the black tanning fluid. Then the  old man will tan the skin  and then you can take it to the armorer to make it into armour.