The blood elves (a.k.a. sin'dorei, which means "children of the blood" in Thalassian) are a race composed of former high elves who renamed themselves in honor of their people whom were killed during the siege of Quel'Thalas by the Scourge during the Third War. The blood elves of Azeroth joined the Horde in the Burning Crusade expansion, seeking to reunite with Prince Kael'thas Sunstrider in Outland. They have since reclaimed their capital of Silvermoon City, situated in Eversong Woods. Lor'themar Theron led them in Kael'thas' absence. Now, having discovered Kael'thas' true objective (to summon Kil'jaeden to the world), the blood elves of Silvermoon have abandoned him. Lor'themar Theron, Halduron Brightwing and Grand Magister Rommath have been presiding over Silvermoon in the absence of any officially appointed leader.
History Ten thousand years ago, during the reign of the night elf Queen Azshara, there was an elite magic-using sect known as the Highborne, who dabbled in magics that many other elves considered heretical by drawing upon the power of the Well of Eternity. Fiercely loyal to their queen, the Highborne opened a number of portals under her direction that brought forth the Burning Legion, triggering the War of the Ancients. Some time after the Great Sundering, most of the surviving Highborne were exiled from Kalimdor and settled in the eastern continent, founding the kingdom of Quel'Thalas. They became known as high elves. During this time, they created the Sunwell, and switched to a diurnal waking cycle. Their purple skin eventually faded to a pale peach color, like that of some humans and dwarves.
For the history of the high elves in the years between their exile and the Third War, see high elf.
During the Third War, Prince Arthas led his army of the Scourge against them, ravaging Quel'Thalas and corrupting the Sunwell. Most of what was left of Quel'Thalas was burned down by the high elves in an effort to give the Scourge a psychological victory and leave the few high elves left who were making their last stand on Sunstrider Isle. Despite their efforts, most of the high elven population were eradicated during this conflict. In remembrance of their fallen brethren, most of them renamed themselves the blood elves, or sin'dorei, and swore to avenge their fallen race.
Cut off from their source of power once again, the elves went into magic withdrawal. Desperate for aid following the Third War, the blood elves allied with the naga. This was seen as treachery by the Alliance and they were sentenced to death. Prince Kael'thas Sunstrider led his followers to freedom, to the extra dimensional wastes of Outland, the remnants of Draenor, and pledged allegiance to Illidan who promised to grant them a new source of magic by siphoning the chaotic energies of demons. Together with their allies the naga, Illidan led the blood elves to conquer Outland, gaining in the process the friendship of the nearly extinct Broken. The blood elves then followed Illidan to the Icecrown Glacier in an attempt to destroy the Lich King; however, they were defeated by Arthas, who wounded Illidan, forcing the blood elves and naga to retreat, allowing Arthas to ascend the glacier and merge with the Lich King. During the Northrend events, the most powerful blood elves were choosen by the Arthas to serve the scourge as darkfallen, members of the San'layn.
But not all blood elves currently reside in Outland with Illidan: Some have remained in Azeroth. Flushed with their newfound ability to siphon mana from creatures of the Twisting Nether, the blood elves have managed to retake their beloved land of Quel'Thalas. Silvermoon has been rebuilt and the resident blood elves there plot to return to Outland, where they can reunite with Kael'thas and achieve the golden destiny he promised them.
Unfortunately, the decisions of Kael'thas to continually accept the aid of the naga and willingness to use fel magic have caused blood elves to be shunned by the Alliance. Thus, the remaining blood elves on Azeroth looked to the Horde to help them reach Outland. Addiction to fel magics and the desperate search for a cure are things the Orcs are very familiar with, and many older orcs who've experienced similar addictions feel a kinship with the blood elves. The trolls who have been the ancient enemy of all quel'dorei since antiquity accepted them warily.
The Forsaken have been working closely with the blood elves to purge the greater Plaguelands of Scourge presence since their induction. Lor'themar Theron was Sylvanas Windrunner's second in command during the Second Battle of Quel'Thalas, and many Forsaken were high elves culled from the same battle. The aid provided by the Forsaken has included reinforcements, a number of outposts in and around the reclaimed blood elf territories, and a teleportation device between the Undercity and Silvermoon.
