The Etherians live on a planet called Aluria, they do not live on the same planet as TDN, DD, and TDR. They have an enemy called the stellarians. The Stellarian Unity formed when an Etherian called "Corrupt" realized that they weren't living on a utopian planet. A darkness surrounds them and the 4 queens never told anyone because they didn't want to cause a riot.
Corrupt is a very corrupt person and wants to destroy Aluria and everyone living on it. Corrupt wants to remove every living thing on Aluria, as well as the entire galaxy. The Stellarians attacked the Etherians, leaving them with most wildlife being dead and disintegrating. Corrupt, as well as the entire Sellarian Unity, have the power to remove anything out of reality, ranking them at almost the most powerful group in Aluria.
Corrupt is very serious, they do not like jokes/humor. The 4 queens are; Seraphic, (ranking her as the most powerful person in Aluria.), Empyrean, (Ranked at the second most powerful.), Dazzling, (Ranked at the third most powerful.), and Ebullient. (Ranked as the fourth most powerful.)
The Stellarians are known to be ruthless, killing anyone who stands in their path. Corrupt is a ruthless and merciless leader. The Stellarians use reckless technology and they don't care who it hurts. They live on a foreign terrestrial planet, "Aluria'', within the multiverse. The most powerful group in Aluria is the Etherians, having the power to blow up an entire planet and more. The Stellarians being ranked at second. The Etherians are allies with most of Metroina, (the destiny nation and the dawn republic) i assume they use intergalactic technology to communicate with their allies.
Each One of the queens has their own part of the kingdom. Seraphic's being in the middle, Empyrean's being in the North West, Dazzling's being in the South East, and Ebullient's being in the West. One of Seraphic's islands being part of the underground city, when they first founded Aluria, it was just dust and dead wildlife, so they had no other choice but to create an underground city. The darkness that surrounds them is very deadly to their planet. Killing almost all of their wildlife. Since they weren't able to replant their whole planet, there are still large patches of dead wildlife. i assume since the planet is cold and made of crystals and other colder bodies it is not a part of a solar system with a sun.
They have access to fire themed weapons, which give them advantages for fighting in their cold planet. Empyrean is ranked higher because of her access to fire weapons; she stole most of the weapons from the Stellarians and used them against them to show her past victories. Which make her harder to beat, her weapon smiths also studied their fire weapons and made some of their own so the Stellarians don't have the advantage of knowing their enemies weapon inside out
They have a stone that they are very protective of and the stallerians are trying to steal to use against the ethereals.
DISCLAIMER: i do not know if all of this is true!