Name: Una Tenebrae
Nicknames
He Who Devours All
Herald of Darkness
The Eater of Life
Embodiment of Fear
Bringer of Despair
Ruler of Nightmares
Monster(By literally everyone)
Father of Corruption
Keeper of Insanity
Light's Bane
The Destroyer
Killer of Kings
Slayer of Gods
Patron of Monsters
Gender: Male
Height: 9 ft tall
Sexuality: Straight
Age: Around Hollow's age
Race: Artificial demon/Living weapon
Voice type: Cruel, mocking, ominous, honeyed, venomous, deep, hateful, demonic.
Appearance

Normal form(Out of Nihil's body, or when Light is shone upon him to reveal his actual form)

First form(As he begins to gain power)

Second form

True form(Regains his full power, the one on the right, but without the necklace)

Eyes(Darker purple than in the picture, also has web-like looking cracks all around the pupils)

Weapons: Prefers to use his claws, but will use any weapon at his disposal.

His Claws

Abilities(Passive, mainly Nihil's with some of his own)
Corruption aura: Passively spreads corruption with his very presence, and can affect living things, inorganic objects, the dead and even undead.
Aura of fear and despair: As is with the corruption, Una can put enough fear and despair to cause those around him to go insane, killing themselves to escape it.
Gaze of madness: Looking into the demon's eyes shows the poor soul of his gaze the very origin of insanity, breaking their minds instantly.
-Teleportation/Portal creation/Flying
-Unrestricted movement
-Immortality
-Hyper speed(Moves at the speed of light, sometimes even faster)
-Hyper strength
-Hyper intelligence
-Dream/shadow walking
-Nightmare inducement
-Madness inducement
-Hyper regeneration
-Self-Sustaining
Nightmare manifestation: As Una's power grows, his presence will draw out the nightmares of living beings and give them life.

Resistances: Is practically immune to any physical harm, due to his ever evolving nature.

Powers/Spells
-Emotion manipulation
-Soul manipulation/absorption/control
-Negative emotion absorption/control
-Darkness manipulation/creation/control
-Blood manipulation/control/absorption
-Inner Darkness manipulation: Can control the darkness in others' hearts, often corrupting them.
-Corruption manipulation/creation/control
-Nightmare manipulation/creation
-Dream manipulation
-Mind manipulation/control
-Darkness Embodiment
-Madness Embodiment
-Fear Embodiment
-Nightmare embodiment
-Corruption embodiment
-Nightmare realm manifestation
-Necromancy
-Shadow/Blood/Dark magic
-Moderate reality manipulation
-Illusion manipulation/creation/control
-Weapon creation
-Body manipulation/control
-Light removal/corruption
-Intangibility
-Invisibility
-Element/Dark element manipulation/creation/control
-Magic absorption
-Life energy absorption(Only in direct, physical contact)
Weaknesses: Light in any shape or form can harm him, or render him weak enough to be destroyed by other things.
Personality: Hateful, deceitful, cunning, bloodthirsty, cruel, intelligent, trickster, very untrustworthy, animalistic, extremely sadistic, manipulative, psychotic, merciless, malicious, relentless, unforgiving, utterly selfish, immoral, predatory, utterly unpredictable, arrogant, very prideful.
Likes: Killing, torture, corrupting innocence, insanity, blood, darkness, inflicting pain, spreading fear, breaking the strong, taking what he wants, hunting the weak.
Dislikes: Light, kindness, love, families, mercy, those who resist him, being challenged, selflessness, all living things, especially loathes Lights, honor.
Backstory: Created by the Shadows and Hollow himself as the ultimate weapon to be used against the Lights, the Shadows soon realized their mistake as Una immediately tried to kill his creators, Hollow defeating his creation and locking him deep in the city's dungeons. It was only after the massacre of his people did Hollow, in his blind rage release Una to wreak havoc on the Lights, almost singlehandedly wiping them and everything else off the face of existence. Having been missing since the fall of the Lights, Una has appeared within Nihil's body, waiting for the chance to destroy all of creation once more.

Notes
-As Una gains power, it's sheer instability and potency manifests itself into a dark purple lightning storm which grows with his power. Una can choose to keep it in check or let it rein free.
-Una's claws possess a unique and faint poison that cause a being's nerve endings to go haywire, increasing the feeling of pain tenfold, which is harmless in small amounts but incredibly lethal if given in large amounts.
-Una can transverse the nightmares of any being once his power reaches a certain point, torturing them mentally, but is unable to actually harm them physically.
-If he tortures someone long enough, it instills a presence in the victim that causes horrific waking nightmares and hallucinations when they are alone or in a dark room, triggering them. As he grows in strength, the nightmares become progressively worse, to the point of the victim being unable to tell reality from nightmares.
-As the origin of corruption and madness, Una has ties with many ancient and powerful creatures also bent on the destruction of life itself, which are currently slumbering in the darkest corners of the universes. They will surely awaken when he does, drawn to the power of the demon....
-Una does not care at all for worshippers, seeing them as being nothing more than a distraction, but has seen their usefulness in the destruction he so craves. As such, he sometimes encourages these self proclaimed "followers", urging them to get rid of any who could threaten him and prepare their worlds for his coming.
-Despite Una's seeming invincibility, he cannot escape his weakness to Light, having a large scar on his chest from a hammer inflicted blow as proof of it. As such, he does everything he can to destroy anything of Light before it can harm him.
-If he finds someone he considers "interesting", as with a few very unfortunate souls, he will often brand them with his mark, one that causes an unbearable cold to the victim when he is nearby.
-Una's vile nature knows no bounds, as he makes sure to inflict as much pain as possible on couples or families, making they can witness the agony of their loved ones. He pays special care to children and women, making sure their suffering is as painful and prolonged as possible.
-The stronger an opponent is to Una, the more interested and excited the demon becomes, as he wishes to see what it would take to make them break before him. Primordials and Titan dragons/beasts are to be especially warned, for obvious reasons.
-He will take young teens, children and even infants, turning them into monstrosities and set them loose on their former homes and families, watching as they tear each other apart.
-Very Important Note: Una can only gain power in certain ways, such as feeding on nightmares, committing massacres, and consuming the power of ancient and powerful artifacts.