Red Demons

The are a family of lower-class demons within the Demon Clan.

Appearance
The Red Demons appear as large, obese creatures with clown-like faces. They possess sharp claws and teeth, along with two ridged horns protruding from their heads. The veins on their necks are prominent and can be easily seen.

Personality
The Red Demons are savage monsters, though possess a level of intelligence. They are shown to be destructive and impossible to reason with.

3,000 years ago
The Red Demons were sealed along with the rest of the Demon Clan after losing to the Goddess allied clans in an ancient war. However, a number of individuals somehow managed to escape the seal.

Bandit Ban
Just as Ban offered to find Elaine's brother, the Red Demon suddenly appeared, probably to steal the Fountain of Youth, and started burning the Fairy King's Forest with its purgatory fire. Ban, immediately instructing Elaine to take the cup of the fountain and escape, began attacking it and successfully removed its heart. However, it did not die, since demons possess more than one heart, and then fatally wounded both Elaine and Ban with its claws. After Elaine made Ban drink the Fountain of Youth, he becoming immortal, quickly and angrily defeated the demon.

Sometime after it was killed by Ban, its corpse was found by some knights who were sent to investigate the Fairy King's Forest's destruction, including Hendrickson, who also discovered a power enhancing quality of the demon's blood, and that its blood could transform compatible living beings and draw out immense power after witnessing crows mutated after they ate its flesh. This quality of its blood has been used by Hendrickson to secretly increase the abilities of many ordinary Holy Knight apprentices, many of whom were considered as failures. The apprentices were called the "New Generation" with the kingdom unaware of their new abilities' origin. Hendrickson also experimented on himself as well, resulting the obtaining of Demon powers and Hellblaze.

Byzel Fight Festival arc
Twigo and Jericho are brought to the cave, where the Red Demon's corpse is hidden by Guila. After receiving explanations about the qualities of its blood, the two decide to drink it due to their desires for greater strength. Twigo, however, explodes due to being incompatible; Jericho remains fine and survives after ingestion.

Kingdom Infiltration arc
As Great Holy Knight Dreyfus leads a strike group of Holy Knights (Gilthunder, Howzer, Guila and Jericho) into Merlin's old castle, Helbram expressed worries of what would happen if Dreyfus find the Red Demon's corpse beneath the castle before encountering Diane underground.

Later, when the five of the Seven Deadly Sins battle Hendrickson at the ruins of Merlin's old castle, Ban discovers the corpse after being sent flying into the wall by the Great Holy Knight. Recovered, Ban questioned the Druid's acquisition of the corpse and then assaulted Hendrickson in full force, that sent him flying into the wall. The wall collapsed to reveal the chained demon's corpse with the Sins' shock and Hendrickson laughing in confidence. Hendrickson reveals how he came by that corpse and used it to make countless experiments on the Old and New Generations and himself, boasting of the vast powers he had gained before attacking the Sins again with Ban taking the blow and revealed to the Great Holy Knight that he was the one who killed it 20 years ago before pummeling him. After Ban smashed Hendrickson far deep underground, the Fox's Sin of Greed destroyed the demon's corpse with his nun-chunks.

Abilities and Powers
The Red Demons are shown to be powerful beings, capable of mass death and destruction. In its battle against the immortal Ban, it demonstrated great strength to withstand and persevere through a barrage of lethal strikes, leading to a battle of endurance between the two. Its claws were strong enough to greatly wound Ban, who only survived the onslaught due to the immortal regenerative powers gifted to him by the Fountain of Youth.

As members of the Demon Clan, they retain the characteristic biological features of their species, including possessing multiple hearts and the ability to create unnatural black wings that they can use to fly. Their most catastrophic power was the ability to breathe "Purgatory Fire" (煉獄の炎, Rengoku no Honoo) from their mouths. This unholy, black flame was so destructive it could even burn the Fairy King's Forest to the ground; a forest that could not be burnt by natural fire. They are also capable of firing destructive beams from there eyes, which one used to fatally wound both Ban and Elaine before they had time to react.

Their blood possessed the unusual trait of unlocking great power within certain individuals. Those compatible to the blood receive unnatural power upon consumption, shown by their eyes changing color to an eerie black. Incompatibility to the blood leads to rapid swelling of the body, ultimately causing the individual to explode and die.

Their power Level varies between individuals, ranging from 1000 to 1300.

Bandit Ban

 * Ban vs. Red Demon: Lose

Current arc

 * Gilthunder, Howzer & Griamore vs. Red Demon: Lose

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