Speak with Strahad Farsan in the Barrens.
It is time you learned the felhunter summoning, [player]. I do not have the reagents and items necessary to teach you here, so you will have to seek out another, Strahad Farsan, another of our inner circle.
He makes his residence in the goblin port of Ratchet. I will send word ahead of you to inform him of your coming.