Kael'thas Sunstrider

Kael'thas "Kael" Sunstrider was a senior member of the Kirin Tor and the Prince of Quel'Thalas, the last of the Sunstrider dynasty. After the fall of Quel'Thalas, Kael'thas led what remained of his people in the service of the Alliance. Striving to placate his people's addiction to magic, he later covertly allied with Illidan Stormrage and the Burning Legion. He was branded a traitor after his allegiance with the Legion was revealed. Kael'thas plotted to summon Kil'jaeden through the Sunwell, but his plans were foiled by the Shattered Sun Offensive. He was defeated by their forces in Magisters' Terrace.