Nieran 'Tarn' Tenebria

Nieran was a simple mortal man who spent most of his days teaching the followers of the God of Chaos Zamorak the art of Kourendian Necromancy. Then came the merger of worlds and universes, among other things far outside of his control, that turned this slightly-maddened teacher into a true powerhouse of Black Magic, Necromancy, Technomancy, and Chronomancy.

Before the Merge
Before things went to absolute shit, Nieran (known as Tarn Razar at the time) had a simple life as a mere peasant of Kourend, living in House Arceuus as a scholar studying the Necromancy gifted unto the House's citizens by the Dark Altar located north-east of the city. Always the quick-learner, Tarn was able to get enough of a grasp of the Dark Atlar's magic that he was authorized by the nobles of House Arceuus to teach it to those willing to listen and take the necessary precautions. As any wise man should expect, this teaching job did not stay within the island-continent that Kourend for long, for the Zamorak Magical Institute, a Zamorakian order tasked with teaching acolytes how to cast spells as well as arm them with the runestones necessary to caste those spells, wanted this research to give their people an edge in their war against the God of Order, Saradomin.

After an initial struggle that involved a couple ruined undead abominations and atleast twelve Zamorakian magi found dead and used as catalysts for even more horrid necromancy experiments, an agreement would be made that benefitted both sides: Tarn would teach the ZMI how to properly use Necromancy without spontaneous corruptive immolation, while Tarn would learn more about the spells used in the mainland continent of Gielinor. Inevitably, Tarn worked to fuse these different spellbooks together, inventing spells not even the elders of House Arceuus could've come up with on their own, and solidifying Tarn's status as a paragon of unholy sorcery on this side of the planet.

Then the God Wars happened, and while the war itself was documented for all to see, ranging from how close Zamorak's legions were to absolute world domination to being cornered to the northern reaches of that continent before it got fucking nuked to kingdom come, all as a fourway battle for a sword capable of killing Gods was going on literally seven miles just to the west of the final battle was going on, Tarn's involvement in the war that ended yet another Age in the world's existence was left out of the history books, partly because of a back-end deal between the Zamorakians and House Arceuus, but it was mostly because of him meeting this odd mistress named Ana Au'eir, who was capable of manipulating time despite being slumped against a cliffside and dying. This not-so-old sorceress handed Tarn a peculiar pocket watch, and with what little guidance Ana could give before she fell and succumbed to her wounds, used it to escape the world entirely before the aforementioned nuking. Everything that happens after, from the accidental isekai'ing across worlds that not even Tarn could fathom to straight-up dying only to be reborn and living a good couple-or-so decades in a whole new world before being killed again and repeating the cycle in a completely different domain than before, is history best left unwritten. To this day, the now-named Nieran draws from his previous experiences as best he can, the most notable influences ranging from his time as a Mhachi Sorcerer and Warrior of Darkness whom lived in Eorzea, to wielding a lightsaber as a Sith Sorcerer whom lived in Dromund Kaas. Even if every life had ended in death- save for his life in Eorzea- either swiftly or painfully, there wasn't a spot of regret on Nieran's multiverse-exploring resume.

Inevitably however, Nieran would find his way home just in time for the God Wars to of started anew. With absolute power and experiences no other Zamorakian could boast at his fingertips and fresh in his mind, a blade thought broken and its pieces lost under miles-deep ice in his hand... the Godsword from the previous war, Nieran was at the doorstep of Saradomin's kingdom: Falador, the capital city of the kingdom of Asgarnia. One battle led to another, one second doing away with the White Knights that called Falador home before Saradomin came in with his winged demigods whom faced the same fate, to the next second being between lovers of a hidden but much-needed affair. Finally, fueled by anger and the pain of these battles and with tears in his eyes, Nieran had leapt impossibly high with the Godsword raised over his head.

One swing was all it took...

After the Merge
Everything was a blur... Nieran found himself face down atop the mountain pass that bridged the Black Knight's Fortress based at the northern cold regions of Asgarnia to the city of Falador to the south. One look down upon himself with his oddly-heavier head and Nieran was hit by the biggest wave of confusion he has ever had. What clothed him was not the finest suit of armor he had ever created, in its place was a tattered, all-concealing robe that hid rusted and damaged armor of gothic designs... and exposed bones. Atop his head was an oddly-Osirian helmet, and with bright purple eyes could this once-normal man see through the thick silvers and corroded titanium of his new headwear. Almost immediately did Nieran wonder: ''Has he merged with his previous lives in order to become- this? Why did he feel so incomplete?'' He needed answers, and he needed to get the hell out of this world, for Nieran could just feel the unnaturally-holier and hotter atmosphere that took all of Gielinor.

An unfathomable amount of time had passed at this point. Time blurred together, an exact date on how or when he plucked the Staff of Armadyl, a divine artifact that has been three-times-used to slay gods, from the cold dead hands of a mortified Dragonkin remains unknown, but with what power the war-fractured artifact had left was spent getting the hell out of that world. Somewhere during his lost and confused travels, Nieran ran into a woman named Notha, and together they discovered some alien ruins that turned out to be a sleeping Mecha-Dracolich named Myalos.

From there, Nieran just lived, hoping to one day do as Zamorak did many, many ages ago. Mind you, while Zamorak slew his master to usurp the throne, the Nechronomancer intends to save the world. He just needs an army and a couple weapons repaired first...

Appearance
Nieran Tenebria was a man that had your average supersoldier build... I am not kidding, think Cloud Strife but properly an edgelord and with a much more normal hairstyle and a love for more colors than black and blue and a similar love for ‘Fuck you’.That was what Nieran was, a normal mortal man whose sharp red-orange eyes stared with confidence at anyone who aided in his research for the betterment of his people. Hair of black and brown hues blowing in the wind during an outdoor trek to another research site containing forbidden knowledge and skin that showed some tan and exposure to lots of outdoor fighting. This was a hero that Nieran once was, but now…

In Nieran’s place is a practically-cybernetic undead warlock that has ascended to a stage akin to Lichdom. Robes of tattered faded blacks hiding a humanoid and skeletal form underneath, armor of gothic fashion and jewelry of pristine silvers and tarnished golds and crystals of the whole rainbow spectrum hidden under his robes, and bright purple ‘laser’ eyes that stare far into the space above his former home. Despite previously being ash and bones under those robes, visible through the holes of his armor, there have been attempts to- for a lack of a better word- 'reforge' his old body. Sure his hair faded in color, his skin having paled and his eyes becoming a misty purple color, Nieran yet remains a keeper of forbidden and ancient knowledge… and a benevolent soul willing to help those who still live, as if nothing has changed.

... Well, technically something has changed, but- aside from the obvious, that's a tale for another time.

Personality
Despite his looks, his penchant for destructive magic and his choice of colors and the fact he proudly embraces his role as a necessary evil to many a tale, Nieran is honestly not that bad a person. Sure his voice may sound disembodied and echoing like a spirit made restless, but Nieran is still the same as he was when he was still mortal.

Some days he’s the embodiment of Lawful Evil, other days he’s playing hero and being the kindest Lawful Good fella you’d find around. Granted, given the fact he died and was re-risen by means unknown, he has become a bit more jaded and found himself to be of a more neutral spectrum. Despite looking like a being of pure evil, Nieran has become more of a wise sage figure, one that is willing to share his couple centuries of knowledge… assuming the person asking for it is worthy of the lectures and teaching.

… Basically Nieran’s tired of people’s shit but he knows his time is up. He’s just vibing and exploring while looking for people worthy of his couple-centuries worth of knowledge while also checking out places he ever had a chance to earlier.

Likes: “What do I even put here without sounding like your typical evil mastermind?”

Dislikes: Saradomin, Empires, Wasted knowledge, Civilizations being forgotten, History being left undiscovered, Unjust rule, Tyranny, and just having unfinished business.

As for Hobbies… can Research be considered a hobby? What about experimenting? Golem construction? Enchanting? Scrapbooking? No? Well crap.

Equipment
Throughout the couple centuries of his life, Nieran was always a spellsword of sorts, preferring blades over just simple staves. His time starting off as a simple mage that was terrible at close-combat when he first started his travels taught him to use enchanted blades that could double as spell foci to deal with enemies close and far. While his choice of weapon always swapped between mere staves and swords as big as he was, he finally settled on a weapon when he ascended to a state of near-limitless power: The Staff of Armadyl.The staff was a highly-coveted artifact that once belonged to a multi-winged, bird-like God of Justice. As one would expect of powerful artifacts, this staff has changed hands between many people, between generals that would overrule emperors, to lich-like sorcerers that tried to rule the world, to a Dragonkin that had defied his god and had control over the threads of time.

Inevitably, these evil-doers all fell, and soon enough did this prized and once-almighty and powerful staff, albeit damaged and unstable from unjust use, find itself in the hands of an eternal researcher named Nieran. Despite losing most of the power that made this weapon an object of many a mage’s lust for power, Nieran knows well that he could use the staff’s instability as a focus and conductor’s wand for spells not of its world. With it, he could use the temporal energies it soaked in from the Dragonkin’s greed to cast spells that are not from its origin world and to speed himself up and slow his enemies down. Without it, however, he has no access to magicks of divine nature, especially those that let him fuck with the flow of time of himself and those around him.

... As for his armor, it is odd that the lich-like warlock has taken to Osirian design in terms of separating himself from the average edgelord, Nieran is infact paying homage to the fashion choices you’d find in his home kingdom of Kourend.

A helmet themed after Anubis, God of the Dead, fashioned in aged Titanium and tarnished silvers with the only color being from the glowing purple eyes shining through the eye holes cover the Lich’s head, with his jewelry-like accessories, belts, and shoulderplates are made of that same luster-lost metals. His aged robes of tattered black silks and leathers trimmed with royal purples cover the rest of his human-shaped body, going all the way down to hide his supposed lack of feet as this unnatural warlock tends to float wherever he can like a damn ghost. Of course, his robes expose bandage-wrapped arms from the elbow down, with the occasional accidental unravel hiding naught but bone- if anything at all- connecting oddly-large mummified arms to glove-like gauntlets of gothic design and infernal aesthetic. Let not the age and state of these overflowing robes fool you though, the countless enchantments on this armor and garb protect Nieran from anything even resembling death, between a Ring of Life that warp him away to safety, to his robes feeding and channeling arcane energy launched at him into mana and power he can use to throw spells right back in an even deadlier, but limited, fashion.

''Nieran does have one more weapon in his possession, but not on his person, for it is far too broken and powerless to do much in this mess of a multiverse he found himself in. Maybe if he can fid a way to reforge it, empower it... just maybe...''

Spells and Abilities
Despite his couple-centuries of proper age, Nieran has been and always will be a sorcerer of great and deadly talent and power, even if in some incarnations he wielded blades of indestructible material and roared to the foes he charged at recklessly. It was only inevitable that someone goes full circle, and despite his merciless proficiency with the sword, the once-mighty hero of times long forgotten has risen as a Lich-like entity, and has returned to using destructive magic as his choice of weapon. While his spellbook is vast and practically limitless thanks to years of collecting and studying, Nieran has spells that he favors over all else.


 * Kourendian Necromancy: The first series of spells that Nieran was taught and got his hands on. It started out as the power of using the Dark Altar as a medium to free souls trapped in monster cadavers (most of the time its just heads), slaying the vengeful spirit the spell conjures, then watching the newly-freed departed move on to a better place. Then some discoveries happened, some brought on by Nieran himself and many more brought on by more wicked sorcerers, and the Arceuus spellbook became more than just a means of putting trapped souls to rest. House Arceuus has evolved, and Nieran gladly repays the people of Arceuus by sharing his own research with them, for it is through their teaching that the young necromancer could cast deadly and unholy spells including but not-at-all limited to:


 * Undead Grasp: Conjure a pair of ghostly or skeletal hands to claw to make them bleed or bind your foes in a tight grip just long enough to cast an even deadlier spell.
 * Dark Demonbane: Arc a whole storm of shadow-infused lightning at your enemies, dealing extra-powerful holy-burn damage to demonkind.
 * Corruption: Leech MP or a similar resource from your target while dealing minimal darkness damage over a long period of time.
 * Ward of Arceuus: Shield yourself from the dark arts for a moderate period, warding off effects that may otherwise Silence, Stun, Control (or similar) the caster.
 * Lesser/Grand Haunting: Two of Nieran's personal spells. Commune with a small wellspring or a whole horde of vengeful spirits, feed them with your MP before watching them erupt from the ground your enemies dare stand from multiple small geysers or one big geyser!
 * Grasp Essence: Has his foe recently cast a spell? Did you know that you tend to radiate with mana/aether of that spell's element after the fact? Nieran can reach for, grasp, and rip it out to replenish his own mana/aether supply while leaving the recently-stolen-from victim woozy for a few seconds and suffering the 'cost' of their spell twofold... All while Nieran is probably charging up a deadlier version of the spell you just tried to kill him with.
 * Crumbling Wail: Drawing from his newfound pact, Nieran can take a deep breath... before swinging his head back and letting out a very Banshee-like wail that'd force groups of enemies to kneel, as well as probably kill those with more sensitive hearing as slowly and painfully as possible.
 * Shadow Veil: While not quite the same spell as used in the Arceuus spellbook, Nieran's pact has adapted a spell used for better thieving attempts to better suit for incase he needs a quick way to escape. What's a more fun way to get out of a tricky situation than being consumed by a small tornado of shadows and just outright vanishing to somewhere safer?


 * Resurrect Lesser Undead: Raise either a magic-firing Ghost, a bow-wielding Skeleton, or a frenzied zombie with a big sword from a ring of magicked fire. While the typical newcomer to necromancy could only summon one thrall at a time, Nieran can conjure up to eight... they're all pretty weak when it comes to durability, however. Not like the corpses of these re-slain undead can't just be re-raised of course!
 * Undead Assault: You know, its been awhile since there's been a sudden stampede of skeletons, zombies, skeletal abominations and incomplete abominations. Nieran wants to fix that, by conjuring a dark portal leading to House Arceuus' labs and letting whatever comes out to charge at his foes with murderous intent! Between zombified forest animals led by a headless bear, a whole pack of skeletal hounds with bloody teeth, or just a whole f-ing zombie dracolich, all that and oh so many more possibilities will come pouring out in enormous numbers before being recalled back to House Arceuus once the portal closes a few seconds after.
 * Death Charge: Thanks to the teachings of his new masters and their help for better adapting otherwise-useless spells to better suit his needs, Nieran can reach for a recently summoned minion and just pluck out the dark magic that animated it, using their essence to restore a great portion of his MP/Aether/other resources.
 * Resurrect Greater Undead: As expected of the mightiest Necromancer in all of House Arceuus, it is only fair that he has his own special roster of minions to call upon should the time for playing with his enemies come to an end:
 * Summon Knights of the Round: Drawing from a doomed timeline for inspiration, Nieran can summon a couple of Deathknights themed after King Arthur's Knights of the Round Table. While these are all skeletal knights clad in gold-trimmed ebony armor with evil/skeletal aesthetic, some more armored while a couple wear more leather than platemail, they all have their specialties, most notably: Sir Dinadan (Steals items and sneak attacks), Galehaut (Juggernaut with lethal swipes), Mordred (Occasionally uses Dark Arts), Galahad (Literally an undead Paladin), and Gawain (Dullahan with a sickly green battleaxe).
 * Summon Ancient Warriors: Drawing from the very same icy prison that the God Wars took place in, Nieran can conjure simulacrums of the three Zarosian war heroes that are just as real and powerful looking as the real deal! Whether it's Torva (Tanky-as-all-fuck Knight ), Pernix (High-Mobility Sniper), or Virtus (Master of Ice, Smoke, Shadow and Blood), Nieran can summon up them to his side and swiftly turn the tide of any battle. Though, if he needs to borrow more than just the three Zarosian heroes, the Ancient Prison is home to many a restless but less-powerful soul just begging to get out, he could just pluck up to four and let them go fucking apeshit.
 * Call Dracolich Divebomb: See that shadow in the distance? That's a simulacrum of the very dead Primal Fire Dragon, Akriloth, zombified and headed this way to breathe his flames upon the whole battlefield in a quick, near-instant strafe. For as long as another spell doesn't extinguish the fire, these necrotic flames will slowly burn Nieran's foes and empower his Black Magic by reducing their cast time and making mana costs practically non-existant for- at most- Nieran's next four spells, reducing the intensity of these flames with every cast.
 * Raise Tormented: It... is peculiar that a Necromancer would summon a Demon of all things to his side, but then an encounter with a Mahjarrat named Lucien opened his eyes to one particular breed: The Tormented Demon. Somewhat undead and burned alive, parts of their body fused with a powerful draconic metal named Orikalkum all while on fire, the Tormented Demons are powerful and could bring down city walls with but a punch of their gauntlet'd hands or a blast of the unholy flames they are just overabundant in, and are pretty tanky thanks to the aforementioned armored flesh and the apparent fire shields they protect themselves with. While Nieran is only powerful enough to summon one at a time, one Tormented Demon is all Nieran needs to have a lumbering infernal guardian that he can draw from for fast-casting, cost-less Black Magic.
 * Black Magic: Yes, Final Fantasy's Black Magic. Nieran understands that this basic system of spellcraft acts as the 'template' of a good deal of sorcery found in many, many other worlds, and by mastering this template would atleast give him a base understanding of how to cast magic anywhere. From being able to cause great fiery explosions above his enemies heads to conjuring a bed of massive icicles beneath their feet, or conjuring a thundercloud that rains rapidfire lighting upon his foes, if it's considered Black Magic in Final Fantasy, Nieran probably knows how to cast it (with different MP costs and cast times, mind you). While the following spells not quite black magic, they have similar elements and level of destruction as them while also hailing from Nieran's homeworld, Even better is the fact that there are very few Gielinorans that can cast what are called God Spells, especially one of his own making:
 * Flames of Zamorak: Conjure a ring of fire around a group of enemies, before a huge funneling pillar of hellfire erupts from the ground within that shallow ring.
 * Saradomin Strike: Raise his staff up in the air, letting a bolt of lightning fire up into the clouds, before an even deadlier pair of holy lightning bolts smite his enemies.
 * Storm of Armadyl: Conjure a funnel of wind that quickly grows into a full-blown ‘mini’ tornado, complete with a volley of sharp feathers to shred anyone sucked within.
 * Bandos Quake: Stab the pommel of his staff into the ground, making the floor around him quake and rumble as pillars of unstable magic erupt and blast surrounding enemies.


 * River of Souls: While not quite a god like Zamorak or Saradomin, with how much time Nieran has spent in the Wilderness' Mage Arena and proving to be quite the mentor and champion both, its only fair that the master of the Mage Arena help the Kourendian necromancer fashion a spell of a similar fashion. By raising his hand or staff, eldritch portals are opened to flood the battlefield up to the ankles with River Styx, empowering Nieran's defenses and cursing his enemies a slightly greater vulnerability to his necromancy. Of course, any fallen minions would drink deep of this river of souls, rising back up from the ground with newfound strength and ferocity.
 * Chronomancy*: It started with using a peculiar spiny pocket watch to isekai himself between worlds, a curse placed upon him to live many different lives in worlds that are not his own. He couldn't permanently die, but he would live lifetime after lifetime, all short-lived and either playing the hero or the dark lord dooming a world. At the time, Nieran didn't know that he was being used to fill holes in timelines that would've otherwise destroyed all the others in one big consuming boom, but now... Nieran's understanding of how to manipulate time didn't come until after he returned to Gielinor and after his former lives merged with his current one to grant him his- err, 'new' body, and even then, he was without a focus to try and experiment with time itself until he plucked the Staff of Armadyl from the grip of a Dragonkin that used time magic in battle. The fractured artifact absorbed some of the Dragonkin's time magic, and from there... need what happened next even need explanation?
 * Haste: Double the speed withwhich you can react to things, as well as make cast times practically non-existent (but not cooldowns).
 * Slow: Slow time to a crowl for either his opponents or the world around himself for brief moments at a time.
 * Stop: Halt an opponent's flow of time for up to seven seconds, or stop time around yourself to 'glitch' across the battefield.
 * Undo: Instantly undo the past few seconds to ward off a lethal hit, but leave yourself vulnerable for the next second.
 * Rewind: Slowly rewind time on yourself or an ally, healing longer-lasting physical or structural damage on yourself or buildings.
 * Spell-in-Waiting: Augment your Black Magic to stop their cast just before they finish, turning them into either ticking timebombs or paradox landmines just begging to be triggered.

* Of course, without the Staff of Armadyl, even fractured, there's no way in hell Nieran will be able to cast any of that.


 * Technomancy Creation Magick: Let's not kid ourselves, while Nieran has experience as an Artificer, he does not have enough know-how to make and maintain magic-less machines, all of his knowledge pretty much came from watching others, stealing How-To guides... and helping maintain an enormous fuck you mecha-dracolich. In complete honesty, Nieran is less so a man of technology, and more a mage of anything else. Then Nieran remembered his time in Eorzea and realized Technomancy pales in comparison to the ancient Amaurotine sorcery that is known as Creation Magic. While the people of Amaurot were powerful Art-Deco Wizards that could create and make anything they could put their minds to it, Nieran was flawed in this field, finding himself unable to make anything living... not like it mattered when he could create buildings and weaponry out of thin air using a neat little thing that he calls Terraforming. Granted, Terraforming is the word for trying to turn a planet into a habitable space, Nieran’s definition of it is turning what is essentially nothing into a fully livable fortress all for himself and those who need it, turning a completely desolate plot of land into just another lair for him to hide in. The process begins with Nieran defining a plot of land he wants to Terraform, before he channels an absurd amount of mana, supplied by leaching from the land around him, to quite-literally 3D Print himself his new base of operations, turning a flat spot of land into an outline made of semi-solid ‘data’ before finally solidifying this creation into a proper structure.  Bear in mind that the largest 3D-printed construction Nieran can make is… well, think of Buckingham Palace. Maybe twice that size. Nieran isn’t capable of making anything larger in one session, lest he wants to black out midway through and lose his progress, at least not without outside help.  Of course, only a fool would be blind to the combat capabilities of such abilities. Sure, generating walls between him and his foe may take a couple seconds too long, but if you augment that speed with a little Chronomancy… No, there won’t be any buildings being thrown or falling on people’s heads. He isn’t Xemnas for god’s sake.

''Many times have sorcerers and the like underestimated the power of having a voice, and why it's so important to be able to speak your opinions or your incantations. Nieran isn’t that stupid.''

A recent discovery has allowed Nieran access to a branch of magic thought odd and unnecessary, its deadly potential often overlooked until it is too late to save yourself from its diabolical reach. It is… amazing, how wonderful such a simple concept can have so much power, so much manipulation and advantage it could have in the right hands:

The power of manipulating one’s ability to speak.

From giving his voice to the local fauna, a hunting man could be led to believe their prey is being reckless in the face of danger, or an opponent could try to follow this falsed source of noise to locate their foe in a fog bank. Little do they both know, they’re both being led right into a trap, with their target behind them, their sword already through their spine and blood coating the snow.

An even deadlier example of this awful sorcery is the ability to steal one’s ability to speak, to steal their voice and leave the fool silent. Were Nieran a shapeshifter, this would have awful but beautiful uses… Alas, Nieran is a-okay with just using it to activate the oh-so-convenient self destruct timers on his enemies’ equipment, if it means living to survive another day AND getting to see some fireworks of the gory kind.

Weaknesses
Despite all this power and near-limitless possibility on how he could royally obliterate anyone and everyone in his path, there are a few problems with that tactic:

1. All of his spells have some form of telegraph. If his opponent is quick on his feet and can leap out of the blast radius of a spell, they can completely avoid damage when facing Nieran, but this also assumes he doesn’t just use his sharp-winged staff as the world's most divine blunt instrument ever made, complete with ‘blades’ of Hardlight.

2. Mana and Runestones are a limited resource. As much as Nieran would love to be an eternal source of destruction and annihilation, he literally can’t. Even though the Staff of Armadyl supplies its own power to allow for usage of spells no ordinary wizard should be able to cast, if he so happens to misplace his staff would deny him access to the much more powerful but less-spammable half of his arsenal.

3. As expected of a being entrenched into the Darkside as Nieran, his defenses suffer greater damage from Light/Holy-aspected spells and attacks. ''However, every time he is struck with attacks of those elements, his shadow grows. As his shadow grows, he can feed on that darkness to replenish his mana supply.''

3.5 Divine-aspected and Aether-aspected attacks have the capability to one-shot, all the way from incinerating Nieran’s ethereal body and prolonging the time needed to regenerate and reconstruct his body, However, make sure Nieran does NOT block those attacks with the Staff of Armadyl, or you will have a much, much worse, almost Enrage-like, time on your hands...

4. While he could leech life and mana from those he’s fighting, he can’t do that if his foes are already undead, even if in theory them being risen by undeath should make it easier. This is what happens when your one ‘leech’ spell is categorized as Necromancy...

5. His robes, while warded countless and varied enchantments and perfect attire for being an overall-unkillable monstrosity whose very presence used to absolutely fuck the timeline Nieran is currently hiding in, they are barely protective. If you can get past his warding and shielding (Anti-Magic, from a direct and powerful source, will pretty much disable all of them), literally a direct hit from a sniper rifle or pretty much any crushing force would slay the Lich and force him out of the area to heal.

6. While his body is smashed, anyone who has access to attacks and sorcery that directly affect the soul will have around four seconds to deal lasting, practically-irreparable damage to the data-like soul of the Lich, while attempts to seal or imprison the Lich will end in unstable, multi-element nuke-like explosions. After that period, Nieran will be able to escape to his phylactery systems and fight another day, crippled by any damage done to his very being.

In a location undisclosed lie phylactery-like systems that act as a memory databank and a cloning/reconstruction bay, and with the countless antivirus- ironic, I know- and ethereal ‘connections’ acting as failsafes. Because of this, it is incredibly difficult, but not impossible, to slay the Nechronomancer… not without first finding out where he hid his systems and destroying them before hunting down the Lich and finishing the job.

… Thankfully, you will be hard-pressed to find a reason for the Nechronomancer to want to fight you in the first place. He will run, he will flee, he will avoid you, unless you force a reason to want to smite you with the power gifted unto him by his homeland.

Trivia
From Gielinor to Erinn, from Remnant to Korriban, Nieran took many names and many lives. All of which more or less sucked, but they are the reason he keeps his memories in a database so he can look back and learn from his mistakes today.
 * Nieran’s near-three-centuries of life is, in fact, the total number of years he lived throughout different worlds.  From playing heroes doomed to fall because of prophecy bullshit or a hero doomed to fall, to playing the villain who led the edgier side to victory all in the name of balancing out Light and Darkness. All of these roles had varying degrees of success, most of which were forgotten by the Lich now that he’s finally found himself a nice place to hide and live out his days.