Sweet, then I have an antagonist in mind.

[u]Name[/u]: Ru Bain
[u]Nickname[/u]: "The Witch"
[u]Gender[/u]: Female
[u]Age[/u]: 512
[u]Species[/u]: Ascendant (immortal human)
[u]Homeworld[/u]: The New World
[u]Social Status[/u]: Independent faction leader
[u]Items[/u]:
[list]
[*]A black steel pike with a bladed head and hooks for dismounting riders. She's quite practiced with it. The weapon is enchanted with the power to destroy Void matter, a useless power in modern magical warfare. More concerning is its divine blessing, which grants it the power to banish the spirits of those it kills. While it's not any more powerful versus mortals than any other weapon, it's a whole other matter versus immortals. Anyone with supernatural longevity, like herself, is vulnerable to permanent death if this weapon deals them a mortal blow.
[*]A former Imperial Sage named Linus that- "Hey, I'm not an item!" -knows countless powerful spells and- "Don't objectify me! Are you even listening?" -rivals the greatest mages in power. He thinks he's an independent person, but we all know he's just a tool for- "Why don't you come a little closer and repeat that?" Oh, fine, he can be an NPC then. Just so long as he...stays over there...
[*]A featureless bone-white mask that covers her entire face. It's surprisingly durable. It is held in place by an enchantment, and can be removed by touching all five fingers to select edges of the mask.
[*]A black hooded cloak that is fire-resistant, water-resistant, insulated, and doesn't conduct electricity. Not terribly useful in a melee fight, but it'll withstand elemental magic in a pinch.
[*]Enchanted chain-mail armor, because she'd rather not be cut to bloody ribbons and have to respawn butt-naked. The pain is unpleasant too. Dying would ruin her evening.
[*]An enchanted "bluetooth" device for remote communication with her subordinates. Ru designed it, Linus enchanted it.
[/list]

[u]Powers/Abilities[/u]: She is immortal. That's it. She has no magic ability, no powerful talents, nothing to make her stand out (besides uncommon beauty granted when she became immortal). She knows and understands the principles of magic a bit better than most, around the level of sages, and she can hold her own in a fight with most types of weapons, but that's more due to her long age than anything else.

No, her main strength is that she cannot be killed in any way that matters, as she is fundamentally a spiritual being (like angels or sprites - hence the label "Ascendant"). She materializes her body with any select non-living matter from the surrounding area over several hours, and if wounded, can restore it to full health in similar fashion. She cannot dematerialize. The only thing that can truly harm her is a Baneblade, a special kind of magic weapon blessed with divine/miraculous power to banish spirits to the afterlife. If such a weapon deals her body a mortal wound, her spirit will be immediately banished, permanently ending her physical life.

[u]Appearance[/u]: Commissioned art of her outfit awaiting completion by [url=https://www.roleplayerguild.com/users/sho-minazuki]Sho Minazuki[/url]. Wears a black cloak and hood, and a featureless bone-white mask covers her face under the hood. Beneath all her coverings, she is a [url=https://live.staticflickr.com/7864/32590488148_a968d5ce8b_o.jpg]stunning silver-haired beauty[/url] with a [url=https://www.youtube.com/watch?v=m5AcFwDdLyo]voice to match[/url].

[u]Personality[/u]: She almost doesn't fit the profile of a villain. Kindhearted, soft-spoken, and a little too romantic for her own good, she would seem better suited to the role of a priestess were it not for her drive and intimidating posture. This woman wants power, as much as she can possibly get, of both political and magical kinds. She has begun a campaign of conquest against all the major powers, recruiting as many isekai'd summons and talented individuals she can get her hands on. She's been tight-lipped about her reasons, but rumor has it she saw something horrifying when she became immortal that drove her to such measures.

[u]Backstory[/u]: Unbeknownst to the rest of the world, she was summoned here like the others. Emperor Dragan, Lord of the Seven Realms and Master of the Mystic Arts, summoned her out of time and space to become his servant. She was previously a computer programmer for a major developer, so when the summoning spell looked for an individual with superior knowledge of "magic," she was a logical target. The assessment proved accurate. The skills she developed for programming carried over to the writing of magic spells, giving her a natural talent over any other mages.

There was just one problem: being from the modern world, she could wield no magic of her own. So the king contracted her with a powerful spirit, putting immense, unfathomable power at her fingertips - at a cost she never would have accepted had she known. At first, she was overjoyed; who wouldn't be happy to wield incredible fantastic powers? Over time, however, she noticed dark, voided splotches forming on her body. Magic instructors told her it was a good sign, that it meant she was attuning to her contracted spirit and was thus getting better at magic casting. So she ignored them. The splotches got bigger and bigger, until they covered entire limbs - at which point she realized they were not merely [i]covering[/i] her body, but [i]consuming[/i] it. There was no flesh within the darkness.

Frightened, she tried to stop using magic entirely and sought for ways to reverse the corruption, but it was too late. The fiend had consumed enough of her body to seize control over it, and began using her against her will for its own agendas. The darkness continued to spread until the last cell of her flesh belong to it, after which the fiend dragged her down to the dark underbelly of the world.

There she witnessed a hell on earth. Millions upon millions of shadowy fiends, each stronger than the Emperor's mightiest warriors, writhed within the world's core, growing in both power and number with each passing day. Daemons possessed the bodies of monsters and animals to bring death to the living, while Reapers stole the departed souls to bring them back for the horde to consume. The few individuals they brought back alive were devoured, healed, and devoured again for as long as their minds could withstand it.

Unwilling to consign herself to such a fate, Ru struggled desperately against the fiend to regain control of herself. She spent years just learning how to stay alive, and many years more fighting back against a being far stronger than her. She did not regain mastery of herself until centuries later, when she finally ate away enough of her captor's soul to kill it and consume its mana. Now wearing the "skin" (so to speak) of her defeated foe, she fled the underbelly of the world and rose back up to the surface, where she determined to build an army capable of stopping the fiends should they ever decide to venture out of their hole.