Custodes are technically mutated Sprites. When the first bout of Aeterna appeared Sprites were the best equipped to turn their magic back at them.
After decades of using this new magic and adapting it for safer and easier use, among Sprites and Chimaera, they noticed that children of the Custodes were being born different. Different magical capabilities, learning faster and stronger, finding the adapted Aeterna magic easier and more natural.
Custodes became a widespread name for anyone possessing these mutations as well as anyone within the actual Custos Order.
Lux Aeterna, also later known as Lumateruz, are a corrupted version of Umbroki. There are a few things that happen when an Utzan burns out, becoming an Umbroki is one of them. They're a sort of spirit, ones that cant move onto death and are stuck as a mere shadow of who they once were.
It was never very common until someone, a Human/Chimaera hybrid, started messing around with spirit magic and warped an Umbroki so far past any recognition that its black form melted away and revealed a brilliant white Lux Aeterna. A magic leech that does nothing except steal and overconsume everything it touches.
after years of terrorising humans and Utzan alike, this mysterious hybrid was named The Edud, no one knows who it was before he allowed his mind and body to become so warped by it's own magic that runes and spells are the only thing keeping it together.
Centuries of fighting between the Edud and Custodes meant they had to close themselves off from Earth and the humans earlier than they ever could've expected. Utzu was created as a last ditch effort to contain the Edud. One sacrifice to make a new world for the Utzan and trap the Edud and its puppets in the rift between, a seemingly endless white void.
The plan worked. For a while. Long enough for everyone to get complacent and confident. Long enough for Custodes to spread across the new world. Long enough for the general populace to think Lux Aeterna were a myth, a story meant to scare children. There were sightings every now and then but Custodes always banished them swiftly enough that news never spread much farther than the nearest town.
Umbroki in their rightful form were still rare, but had shifted to being made up almost entirely of former Custodes. They often took roles as caretakers or teachers, the main library of Atia was manned entirely by Umbroki for many years.
All it took for it to come crashing down was one watchman who brushed off the blinding flash of light on the horizon as a burst of aurora, something that often happened during the winters. It was the Edud leading his army to take out all the Custodes.
During the initial onslaught on Atia, a few Umbroki, partially corrupted now, slipped away to warn other sects of the attack and summon back-up. No matter how many Custodes joined the fight, they all fell to the Lux Aeterna. they had no hope left until the Elders started a spell, one that Utzu had left for a case of dire emergency. They lured the Edud and its army to the furthest point from any life.
The aftermath of the spell consumed every single being within miles. The Lux Aeterna, the Elders, all the survivors who'd come to lend their magic. All but two Umbroki and a child had been sucked into the void between Utzu and Earth, the last ditch effort to protect both worlds. The veil between void and life and been sealed tight, leaving an enormous crater of nothing instead of the island that once stood. Instead of inky blackness rushing to fill the gap, searing white light pooled in the bottom. Miles of rock before a thin blanket of heat that opens into the void, a fall that takes forever and no time at all before crashing through the opposite side and landing on Earth.
the one survivor of the massacre was none other than Violet Kaymarin. Never knowing how important xe'd become. Xyr father, one of the last Umbroki, tapped into a long forgotten reserve of time magic and opened a gateway to the future. Not knowing fully when he was sending xem, he hoped it was peaceful. Once he felt his child was safe, he went off to guard the new crack in the world. Elvira, the second Umbroki stayed on the ruined Atia and tried to put her library to rights again, in hope that it would help Violet when they next met.
