Armityle

Armityle is a major antagonist in both Yu-Gi-Oh! GX and Yu-Gi-Oh! RED. It is an Aberration created during an ancient war. It was split into pieces called Uria, Lord of Searing Flames, Hamon, Lord of Striking Thunder, and Raviel, Lord of Phantasms for several millennia, brought back together briefly by Yubel and then split once more. As pieces, Armityle was imprisoned briefly underneath Duel Academia.

Appearance
In its true form, Chaos Phantasm Armityle, Armityle stretches to a dizzying height. It has an appearance similar to that of a snake, with a long, slender body without legs covered in red scales and a line of spines down the back, along with gold rings along the belly. Its top half is somewhat more human in the appearance of a torso and arms, though its left arm takes the shape of a long, dragon-like head with red scales and horns. Its head is blue-scaled and armored, with sharp, curved horns on either side of its face. It sports an enormous pair of large bat-like wings with black membrane stretched between the long yellow fingers.

In later evolutions, Armityle gains the ability to present itself in a human form as a disguise, appearing briefly as Ashikaga Kakon to Saki Yamaguchi. As Kakon, Armityle is a slender, tall teenage boy, with pale skin and dark black hair that is shaggier in the front. He wears the long blue uniform of Obelisk Blue.

Armityle has also used illusions to present itself in the appearance of Supreme King Judai.

Personality
Armityle has been described by others as bestial, destructive, and unthinking. The original Armityle was many of these things, being an Aberration with little form of complex thought, driven only by destructive instinct. After many years of imprisonment, however, Armityle slowly gained true consciousness, becoming more manipulative, strategic, and intelligent. As Kakon, Armityle presents as friendly and welcoming, though this is a front in order to put others at ease. Armityle is actually quite cunning, and is fascinated by the world that it is just beginning to understand. It desires freedom above all else.

Abilities
Armityle is immensely powerful. It can resist most forms of attack, and is capable of increasing its physical strength to enormous heights when in its true form. Armityle also has the ability to craft illusions and implant them into the minds of others as dreams. It can sap the life energy of other creatures, particularly Shadow People, and can implant parts of itself into the souls of others in order to connect them. Recently, it has gained the ability to create small tears in the fabric of reality and weave them into pocket dimensions, where it can lure souls inside and use them as an energy source. It can also project itself into a human shape in order to disguise itself.

History
Armityle is an Aberration, meaning that it was not intended to be created. Armityle was created just before the First War of Existence, when the god of destruction Apep created Red Nova. Armityle was formed out of the tear in reality left behind by Red Nova's creation. Upon its creation, Armityle attacked anything it saw without regard for whose side it was on, completely incapable of complex thought. After Apep's defeat, Armityle hid away, driven back by the light of Horahkty.

During its hiding, it became infected with the Light of Destruction. Due to the influence of the Light, Armityle reemerged and wreaked havoc once more, spreading the corruption of the Light and leading to several Shadow People murdering their soul-bonded human partners. Horahkty, along with the King of Light and Darkness, managed to defeat Armityle by splitting it into the three parts of Uriel, Hamon, and Raviel, sealing each piece in a different part of the world.

Many millennia later, Armityle's influence began to touch the Physical Realm as its pieces sought freedom, and each other. In order to prevent its escape, the King of Light and Shadow of that era had the three pieces made into cards, and sealed the cards beneath Duel Academia using a complex seal to prevent it from being able to wake up.

Yu-Gi-Oh! GX
The then superintendent of Duel Academia, Kagemaru, learned of the secret prison beneath Duel Academia for the Phantasms. Allured by the possibility of using its energy absorbing powers to stave off his old age, Kagemaru developed a plan to agitate the spirits and then claim them for himself. The three pieces of Armityle were awakened, and began to draw in power. However, they were stopped long before they could regain their true form, and were sealed beneath the school once again.

After this, the Shadow Folk Yubel, possessing a Duel Academia student, sought the same power in order to regain their own form. Being Shadow Folk, Yubel knew the true nature of the three Phantasms, where Kagemaru did not. Yubel was able to return Armityle's true form briefly, making use of its energy absorbing power to heal themself. However, before Armityle could permanently inhabit its true form again, Yubel discarded it, leaving it without enough energy to manifest. It was then sealed beneath Duel Academia again.

'''Yu-Gi-Oh! RED'''

Armityle once again began to push against its prison, in an attempt to escape. It caused a small tear in reality, which several Duel Academia students fell through, and then trapped them in a nightmare state in order to use their energy to feed itself. However, it was surprised by the force of will they displayed, and decided to take another route, releasing them and giving up the location of another soul it had been feeding on for several years.

After this, Armityle began to create more dimensional pockets to trap souls inside and feed itself, while it used Hinata Nishimura as a foothold to keep an eye on Judai. Armityle contacted Kylie Harbison through dreams and illusions to encourage to find a forbidden spell book, which it convinced her could be used to make people she didn't like disappear. In actuality, it was using her to plant bits of its own magical energy to create small pocket dimensions, in which to store souls to feed from and create new bodies to transfer into, rather than attempting to break out outright. In the meantime, it visited with Saki Yamaguchi as Kakon Ashikaga, to learn more about the student who had fascinated it in its previous escape attempt.

While its attempt to sap the energy of its captured souls was thwarted, it did gain just enough energy to manifest in a new form and escape its prison, leaving its cards empty.

Saki Yamaguchi
Saki is an Osiris Red student who defied Armityle during its attempt to trap her in a nightmare realm. It is fascinated by Saki, finding her to be an intriguing human, and wanting to know more about her. While Saki is unsure, Armityle does genuinely seem to think of Saki as a friend, though in its own twisted understanding of friendship.

Judai Yuki
Judai is one of Armityle's most despised enemies. Armityle hates Judai for being the one to reimprison it more than once, and has nothing but contempt for him and his desire to defend the dimensions, partially due to its contempt for all Kings of Light and Darkness.

Yubel
Yubel is a fellow Shadow whom Armityle deeply hates. Yubel wanted to use Armityle's power for themself, and Armityle was eager to assist, thinking it could be a way for it to escape. However, Yubel eventually betrayed Armityle, splitting it once again and giving its cards to Judai, who resealed it. Armityle refuses to forgive Yubel for this, having initially thought of them as comrades.