Kael'thas Sunstrider

Keal'thas Sunstrider was once a powerful mage of the Kirin Tor, and heir to the throne as king of the High Elves. He was once madly in love with a woman named Jaina Proudmoore, but upon finding her with Arthas Menithil, was heartbroken and stormed off.

When Arthas had betrayed Lordaeron and raised its people as mindless Undead, he led an attack on Quel'thalas, Kael'thas's homeland. Kael'thas was not present at Quel'thalas, however, as he was to busy in the Kirin Tor city of Dalaran. Not long after, Arthas and Kel'Thuzad assaulted Dalaran, and Kael'thas fled.

About a year later, Kael'thas had renamed his people the Sin'dorei, or "Blood Elves", because of their lust for arcane magic. The Alliance of Lordaeron had nearly fallen, and was now under the leadership of the xenophobic Paladin Garithos. Garithos, harboring a deep hatred for anything that wasn't a human, sent Kael'thas and his Blood Elves on suicide missions while his humans did all the easy work. Eventually, Kael'thas met the Naga, Lady Vashj, who was in the service of Illidan Stormrage. Lady Vashj convinced Kael'thas to join Illidan, and so he did. Garithos learned of this, and sentenced Kael'thas and his officers to death.

Lady Vashj broke into prison, and helped Kael'thas and the Blood Elves escape. They fought through some of the Kirin Tor's strangest experiments, and eventually escaped. Kael'thas was eventually introduced to Illidan, and pledged allegiance to the demonic Elf. Illidan, however, was chased by his former jailor, Maiev Shadowsong, and was captured by the crazed warden. Kael'thas and Vashj fought off Maiev's forces, and freed their master. Maiev fled, and Illidan gave Kael'thas the position as his right-hand man.

Eventually, the demon lord Kil'jaeden required Illidan to melt the frozen throne in an attempt to kill the Lich King. With the help of Kael'thas and Vashj, Illidan invaded Northrend and attempted to melt the throne. This didn't go unnoticed, and the Lich King called for the help of Arthas and Anub'Arak to defend the Frozen Throne from the invaders. In the final battle in Icecrown known as a "Symphony of Frost and Flame", Kael'thas dueled the Death Knight, Arthas. Kael'thas had enough of the fighting, and teleported away. Arthas then proceeded to fight Illidan himself, and defeated the demonic Elf. Kael'thas and Vashj found Illidan's body, and took him back to the Outlands to be healed.

Years later, Kael'thas founded his own seat of power in the Outlands called Tempest Keep. There, he practiced his arcane magic, and thought of how he would make things better for his people. Illidan was not making his promise of eternal power upon the Blood Elves a reality, and Kael'thas secretly began looking for a new master. Illidan's old enemy, Kil'jaeden, promised Kael'thas that he could help the Blood Elves in their search for power, and Kael'thas secretly joined the Burning Legion. Meanwhile, the champions of the Naaru stormed Tempest Keep, fighting off some of Kael'thas's most elite soldiers and his pet phoenix, Al'ar. Kael'thas and the heroes had an epic battle, but the Blood Elf mage was defeated in the end.

It was later revealed that Kael'thas survived the fight, and returned to Azeroth to begin summoning Kil'jaeden into the world through the mystical and rebuilt Sunwell. This did not go unnoticed, and the Shattered Sun Offense sent a group of 5 brave heroes to storm the halls of the Magisters' Terrace. There, they fought Kael'thas once more, but killed the great Elf and took his head so that he wouldn't be able to return again.