Aeon

Æon Shalaxiam / Jamie Spencer is the prince of dark elves and heir to the throne of shadows.

Childhood
Æon was stolen by the dark elf priestess Hemexia as a child and switched with earth child Jamie Spencer putting a long lasting mirage on Æon to hide his elven features. Jamie suffered abuse in his childhood which led his powers to be stunted and hard to control. Jamie joined the dark legion when Sebastian and Emily opened their academy for casters.

Early years with the Legion
Jamie's trauma manifested itself as nightmares that would combine with his powers and cause visions from the shadow realm to appear. As such much of the academy was scared of him and he became an outcast. Henrik, however, became fascinated by him the two eventually beginning to date.

Jamie's powers were a mystery to all, his abilities seemingly not drawn from the Arcane. While searching for the key to her past, Seline accidentally conjured a shadow demon that Jamie was able to control, proving his abilities were linked to hers and the shadow realm. Jamie and Seline both started studying and searching for an answer to their abilities.

Dragon Fight / Azure Chronicle?
Jamie powers up here and uses his ability to project his shadow form.

Dark Elf Plot
After travelling the realms and learning all she can about the dark elves, Seline returns and enlists the legion to help her travel into the shadow realm. She accidentally releases the evil dark elves from the realm though who begin searching for Seline and Jamie to complete their arch of power.

During the pursuit, Jamie and Henrik become aware that an elven grimoire is hidden on earth (in the mirage-d reflection of an old basilica) and travel to find it. Jamie begins studying elven and his powers grow. Jamie realizes he is a member of the 7 shadow court that Seline is also a part of. He is an elven monarch of power, lord of shadows, prince of darkness, etc. etc.

In the final confrontation against the dark elves, Jamie and Henrik get caught in a chamber with Hemexia who kills Henrik. This triggers Jamie to kill Hemexia and destroy the shadow realm around them, trapping all the elven forces into it. Once back on Earth, the legion mourns with Jamie who puts a preservation spell on Henrik's body and hides it in the chamber where they found the ancient grimoire.

Death Curse
Jamie states he needs time to be alone and retreats to the basilica he hexes to be his new home. Jamie spends months studying the grimoire and becoming fluent in elven, along with accessing the shadow realm he now has greater control over. Jamie also searches for a way to bring Henrik back from the dead, ultimately discovering an ancient and secretive elven ritual to revive the dead. Jamie performs the ritual and Henrik is returned from the dead, Jamie also inadvertently releasing Hydrangeotus an ancient curse of death and rot.

As the curse becomes more powerful, more and more people come to Jamie to revive the dead to which he says he cannot. Eventually he is captured and forced to revive an evil witch (maybe tie this in with heartstopper and talia or something) and the veil begins to thin. Ghosts return to earth, but Jamie refuses to lose Henrik. The rot of the dead begins to spread too turning people into zombies and stuff like that.

Jamie grows more and more mad as Hydrangeotus possesses him, and more and more people demand his magic. Eventually Sebastian steps in and they fight, Jamie going against the Dark Legion.

Ultimately, Jamie tries to separate himself from Hydrangeotus (who, up until this point, has come to him in visions and hallucinations) and then seal the death curse into the shadow realm. However, during the spell Hydrangeotus escapes and latches on to Claire Riggs. As the curse of the dead spreads throughout the world, Jamie tries to help but still refuses to reverse the spell on Henrik. Ultimately Jamie realizes this must happen as Henrik begs to be released and Jamie undoes the incantations, weakening the death curse.

Jamie then helps in fighting Hydrangeotus who is then killed by Ryuki and her cousin.

Powers & Abilities
Jamie, as a dark elf prince, has the ability to directly tap into the shadow force, a power similar to the arcane found in the shadow realm. Initially, this presents itself to Jamie as the ability to conjure shadow forms at his will and enter a shadow form in which he has increased strength, impermanence, and minor telepathic abilities. As Jamie's powers grow he also becomes able to better manipulate the shadow force and create armour for himself or structures around him.

After discovering the truth of his heritage, Jamie learns basic elven runes and becomes able to cast minor spells. This only increases as he studies the elven grimoire. Once more fluent in eleven, Jamie becomes able to use the shadow force to construct eleven runes and hexes and more accurately manipulate the shadow force. Jamie also becomes able to better conjure their shadow form, which takes the form of a bat demon when fighting.

When in the shadow realm, Jamie is at their most powerful, able to manipulate the matter of the world around them. After Henrik's death, Jamie's rage causes the destruction of a good portion of the realm and the closing of all access into it. Jamie spends their time after Henrik's death studying as much eleven magic as possible and becomes much more learned in eleven runes. Jamie's powers grow from this and he becomes able to perform more powerful eleven rituals and stronger magic.

Throughout the curse of death plot, Jamie is able to use elven runes to call back the dead, interact with ghosts and cross through the veil into the world of the dead. Ultimately, Jamie reverses the curse and re-solidifies the veil.