While high elves and blood elves are physiologically the same race,[10] high elves generally do not get along with their blood elf brethren. This is owed in part to differing allegiances, as most modern high elves remained loyal to the Alliance following the Second War, disobeying royal edicts from their reclusive masters to return home.[7][49] The blood elves are primarily loyal to their own, and remained in Quel'Thalas, later forming an alliance with the Horde. Other high elves are exiles, having been banished from Quel'Thalas after the return of Grand Magister Rommath from Outland. The practice of draining arcane magic was considered immoral by these elves, who opposed its use. Unwilling to lead a nation divided, the newly-named regent of Quel'Thalas, Lor'themar Theron, chose to exile the dissenters.[11]
Kael'thas's teachings caused some moral contention between the two peoples. By embracing them, the blood elves prioritized their survival, health, and well-being; they believed this strength was needed to see Quel'Thalas restored, as the kingdom had remained a wasteland while the elves were weakened by their addiction.[50]
By refusing, the high elves prioritized their pride and personal ethics, even to their own detriment; they believe this was the moral choice.
With the betrayal of Prince Kael'thas and the restoration of the Sunwell, Lor'themar has taken steps to re-establish cordial relations between the blood and high elves. However, these efforts have had mixed results. Aethas Sunreaver, Halduron Brightwing and Tae'thelan Bloodwatcher have also expressed an interest in mending relations between the children of Silvermoon, though to what extent appears to vary depending on the individual. The high elves, or at least Alleria's high elves, have been granted a representative at the Sunwell in the form of Auric Sunchaser. While he does not consider himself a blood elf, he seems to have little quarrel with the sin'dorei, whom he calls the "children of Silvermoon".[51]
Although the only physical difference between blood and high elves is their eye color - blood elves have glowing green eyes - this is not an indication of their quarrel. Fel magic played no apparent role in the elves' splintering; in fact, its use was hidden from most of the blood elves.[8] Glowing green eyes is the high elven body's natural reaction to spending time around fel magic,[52] which was used in the Magisters' rebuilding efforts in lieu of the destroyed Sunwell's power.[53] Like the orcs, any high elf who spends enough time around fel magic will acquire glowing green eyes.
The feud between high elves and blood elves is most visible in the conflict between the elven factions of the Kirin Tor, the Silver Covenant and the Sunreavers.[54]