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|Theater of operations|
The Ethereum are a sinister faction of ethereals. Once the ruling class of K'aresh, they swore vengeance upon after he consumed their world. Seeking to use the manaforges of Netherstorm to "become void", their efforts were thwarted by the Protectorate. However, they later allied with the blue dragonflight in Northrend during the Nexus War.
Most, if not all, Ethereum members glow with red energies rather than blue.
The Ethereum were once the ruling class of ethereal on their homeworld, K'aresh. Shortly before unleashed his void armies upon the world, the ethereals were forced to evacuate K'aresh, after which the Ethereum vowed vengeance against Dimensius. They have been tracking the void lord ever since.
However, the Ethereum have since grown "dark... twisted". Vengeance has become their only recourse and any that would stand in their way or not join their cause are considered enemies. Many ethereals saw that the Ethereum were plummeting into madness and left. Several of the Nexus-Princes of the Ethereum council abandoned the Ethereum to form other groups and factions with different goals, such as the Consortium and the Protectorate, the latter of which was formed to serve as opponents to the Ethereum.
This section concerns content exclusive to The Burning Crusade.
In Outland, it is discovered that the Ethereum seek not to hunt Dimensius, but to become void. They are manipulating void energy at Manaforge Ultris in Netherstorm to bond their own energy into "nexus-stalkers".
Other than Netherstorm, Ethereum members can also be found in Blade's Edge Mountains and the Arcatraz. The Bash'ir are an Ethereum group in Blade's Edge using Ethereum Prisons and Ethereum Stasis Chambers to capture different creatures.
Ultimately, the Ethereum came under assault by both the Alliance and the Horde at the behest of the Consortium. Not only were their operations in Blade's Edge and Netherstorm stopped, but their leader, was killed as well. Following their leader's death, a group of Ethereum aided and the Burning Legion in the Magister's Terrace, likely led by . When heroes entered the Terrace to put an end to the Sun King, these Ethereum shared the same fate as their fallen Nexus-King while defending Kael'thas.
This section concerns content exclusive to Wrath of the Lich King.
Following the defeat of the forces in Outland and on the Isle of Quel'Danas, the Ethereum sent a small force to Northrend. Though their motives were unclear, it is known that of the Ethereum and of the blue dragonflight were able to work out an accord. Though apparently joining the blue dragonflight in the Nexus War, the Ethereum haven't actively participated in it, except for the Wind Trader's involvement.
This section concerns content exclusive to Legion.
It is revealed that in exchange for their aid in the Nexus War, had promised the Ethereum access to the blue dragonflight's treasures within the Nexus, as it was negotiated in the accord between Goramosh and Mu'fah several years earlier. The Ethereum seeks to become an unstoppable force--to become void, and they are using the surge needles in Coldarra to bore into the Twisting Nether and call up void energies. After is defeated by an adventurer and , Azuregos remains in the Nexus so that it will not fall into the wrong hands again.
|Leader||Killable||Ethereum Staging Grounds, Netherstorm|
|Leader||Killable||The Rift, The Nexus|
|Presumed leader of the Bash'ir||Killable||Bash'ir Landing, Blade's Edge Mountains|
|Captain||Killable||Ethereum Staging Grounds, Netherstorm|
|Leader of the Razaani||Killable||Razaan's Landing, Blade's Edge Mountains|
|In charge of the prison cells at the Ethereum Staging Grounds||Killable||Ethereum Staging Grounds, Netherstorm|
|Ambassador to the blue dragonflight||Killable||Moonrest Gardens, Dragonblight|