Captain Shatterskull
Captain Shatterskull is a level 55 quest giver located at Mor'shan Base Camp in the Horde-aligned territory of the Barrens.
He starts the following quests:
[35] Quell the Silverwing Usurpers (PvP)- [55] Quell the Silverwing Usurpers (PvP)
See List of the Barrens NPCs.