The spear you found certainly has the makings of troll designs from other blacksmithing crafts.
Perhaps somebody at one of the camps here in Un'Goro will know more about it.
You will receive:
- 875 XP
Ay mon, whatcha got der in your hands?
Dat be da Darkspear! Ya found it?!
- Patch 7.1.5 (2017-01-10): Added.