Velen

From wow.incgamers.com

Velen is the leader of the Draenei, or the "Exiled One's" (in their native tongue). Velen was the only main leader of the Eredar that rejected Sargeras' offer of unforetold power, knowing fully well that they would become slaves to the Burning Legion.

Velen is located at the Seat Of The Naaru in the Exodar. From the back entrance of the Exodar, it would be very easy to kill Velen if you were horde as there are only a few Draenei Peacekeeper's before Velen himself.