Ragnarok

Ragnarok (ラグナロク) was a demon that ruled another dimension. He was summoned by Mordred during the "Black Rose Incident" to combat Shadow and was ultimately slain by the latter.

Appearance
It had the appearance of a bluish-black demon, similar to a bat, with a huge body like the demon king Diabolos, with a fanged mouth, it had 4 sharp claws each extending from the tips of its long and thick blood-like arms, legs strong with 3 fingers each, and his whole body was engulfed in flames accompanied by a pair of very large wings with which he can fly.

Personality
Ragnarok even though he is a magical beast and a demon king, his behavior seems almost the same as that of an animal that acts almost by instinct, he attacks when he wants to sometimes, and when provoked. Shadow described him as a being who does not have much of a brain, comparing him to Delta, since he does not exercise his magic or does not know how to handle it well.

Being a rather simple-minded magical beast, the Cult of Diablos found a way to partially control him for their benefit.

Background
When the Black Rose incident occurred, the demon king Ragnarok had the opportunity to briefly appear in Oriana Kingdom but was repelled by the Cult of Diablos, who were very interested in the phenomena of the so-called "Black Rose" and that there is more than one world, apart from the one inhabited by the people of the world where Cid reincarnated, (this was long before Cid reincarnated).

Through a treaty that was made between Oriana's past kings and the leaders of the cult, a calamity was avoided thanks to the cult. But, in exchange for the royal family having to hand over their royal daughters, since Oriana's royal family has a bond of blood with the human Heroin, and the kingdom were to give a majority of their tax revenue to them, resulting in the kingdom to heavily invest on the arts. Also, the cult manipulating the church to vilify their kingdoms Dark Knights and the kingdom basically became a cult's puppet.

Oriana's "Black Rose" Civil War Wedding Incident
Ragnarok is summoned again to the magical world where Oriana's kingdom was there, through the "Black Rose" portal using the "Ring of Succession" that Rose Oriana wore at her wedding, which was really the key to activate "the Black Rose". Then, it begins to generate chaos but quickly loses one of its wings at the hands of Shadow, and they begin fighting to the death outside the capital, which ultimately results in his death at the hands of Shadow as he cutting every demonic members that falls near the battle that Mordred had against Epsilon, Beta, and Rose, who was watching how they fought.

Powers & Abilities
Ragnarok possesses brute strength, magical power, and ferocity that almost rivals the demon king of Diabolos. But, it seems he doesn't have the ability to quickly heal his wounds and isn't smart enough to use his magical power on himself. However Ragnarok he is showntoo weak, though not as weak as Elizabeth, as he was easily killed by Shadow.

Super Demonic Prowess
Ragnarok possesses such a great demonic force, that a single blow from it can destroy a dozen houses or buildings, leaving only a huge crater, it also has a very fast speed, to launch consecutively without looking almost tired, multiple attacks of these blows, being able to vulperize an entire normal city, just with this. At the same time it can exert a strong, albeit small, tremor throughout the aurea through the applied force of its legs, together with its weight as such.

When Shadow fought Ragnarok, he managed to easily, if somewhat surprised, dodge Ragnarok's multiple powerful blows, only to ultimately have the entire Midgar snowfield reduced to a large heat moor, Shadow speculates that if he had fought in the capital of the kingdom of Orianna, the capital would have been destroyed a few seconds after starting to fight against Ragnarok.

Demonic Biomutation
Ragnarok has a highly mutant Demonic biology, which makes any living being from an animal to a person, of any race, who drinks its blood, or eats its meat, undergoes a strong demonic transformation, which turns it into an infernal demon, with a similar appearance to Ragnarok with tremendous magical power, but with the strong possibility of losing his consciousness as such.Even if he dies, his demonic flesh and blood will remain active for an almost indefinite amount of time, though not as much as the Demon Diabolos's body. This is seen when, Modred, seeing that Ragnarok was defeated by Shadow, is all scared and enraged, saying that it is impossible that Shadow could have defeated the demon of the 4th demonic world, so Modred, in his despair, ate, the demonic meat of Ragnarok, which caused him to transform into a powerful demon similar to Ragnarok, with 2 to 3 tenths of the demon's power, although in the end, Modred in his transformed state died at the hands of Shadow, with the strong technique of this "I am atomic sword".

Flight Capacity
Ragnarok, has the natural ability to fly with his huge demonic wings, which allows him to go to great supersonic speeds in a short time (according to what is known in a few seconds), although it was never known how fast he could return, since that Shadow took advantage of the fact that Ragnarok was with his guard down, to be able to cut one of his wings, preventing him from being able to fly, (it is speculated that he did it to prevent this being from causing havoc to the other neighboring countries, to prevent him from escaping and leaving for avoid an air battle, as there is often unprecedented collateral damage on dry land).

Body on fire
Ragnarok has his entire body engulfed by a demonic fire, with a deadly temperature, capable of melting normal rock, and fatally killing any warrior or magical knight who approaches him directly, less than a meter away. Ragnarok can apply said heat to his fists to increase his attack damage, if by getting very angry, his body heat increases more. So far only Shadow was able to face him without any, due to his slime bodysuit protection, and his control over it.

Magic
It is speculated that using his magic could rival the demon Diabolos and being the king of the fourth world of demons, he must have ruled there with sheer insane strength. Even though he is not that smart, Ragnarok has the ability to shoot bursts of magical power from his mouth like a dragon and from his wings as well.

He also has a good healing ability but, compared to Diablos, he is weak, since he cannot regenerate severed limbs as such on a magical level.

Demon Breath
Ragnarok possesses the ability to channel his magic into his mouth, to release a powerful demonic breath capable of annihilating anything. According to Shadow, he could have received this attack without a problem, but fearing that Orianna's capital would be destroyed by the residual attack, he opted instead to avoid Ragnarok launching it sooner.

Trivia

 * The name Ragnarok, means the end of the era of norse gods, of norse mythology.
 * When Shadow annihilated the demon king Ragnarok leaving only one of his members, he did it in a similar way to Olivier when she cut off one of the arms of the demon king, Diabolos. But, the difference is that Olivier defeated him with the help of her fellow heroes, while Shadow did it alone.
 * Ragnarok is classified as a more dangerous existence than Elizabeth, since if she could sweep 3 countries in the 3 days that there was, the red moon, Ragnarok by his side can destroy several countries, possibly even a continent in a few days, if he uses his magical power.
 * Being a very old existence, and mainly very ancestral, it is speculated that this demon has several eons of existence, more than any living-level creature in the world, up to the present date.
 * Ragnarok is one of the enemies, aside from Mist Dragon and Elizabeth, that forced Shadow to get a little serious, in the official part. being the third in it.
 * According to Shadow words, if he had fought directly in a battle of brute force, obviously, he would have lost against Ragnarok.
 * Shadow granted him the title of; 'He more ignorant than Delta.'
 * Mordred is the only one of "the 12 knights of the round table", of the Cult of Diabolos, who consumed the flesh of the Demon King Ragnarok, also managing to be the only one capable of controlling all his magical power without losing control over it, in part, and not going crazy with magical power, for the most part, except in his frenzy of wild rage.