Speak to Menara Voidrender in the Barrens.
Ah, hello, [player]. You're progressing well in your training. So well in fact that I think you should be rewarded for your hard work--and for not becoming corrupted by the arcane yet.
If you're interested, seek out Menara Voidrender in Ratchet. She is currently staying at Strahad Farsan's tower overlooking the town.
She's not very friendly, [player], so don't expect any praise. But if you work hard, she'll make sure you're taken care of.