Basic Setting

Gender: Male. Age: 10.7 billion years. Race: Sea Dragon Demon. Height: Usually 185cm, but decreases to 168cm when power is exhausted or when necessary.

Appearance: Blue fur all over his body, yellow fur on his belly and the underside of his tail, a crimson shoulder cape, a necklace bestowed by Lucifer, a large dragon tail, sharp claws, sharp teeth, sclera-colored eyes, a pair of spiral horns, a vivid pink mane, and pointed ears.

Role: The Archdemon of Envy among the 7 Deadly Sins, a guardian, and an absolute subordinate who follows Lucifer, the God of Chaos in Hell.

Leviathan's Abilities and Powers

Power: Wields hellish water magic with ferocious speed and lethal attack patterns.

Water Magic:

He can cause floods to submerge the land, with water depths ranging from 1cm to hundreds of meters, regardless of the area's size or the amount of surrounding water.

He also controls water to create floating droplets. These floating droplets obstruct vision and movement, and he can use them to launch chain attacks from all directions.

Physical Abilities:

Extremely agile, dealing fatal wounds with every strike. He possesses a relentless nature, attacking frantically until the target is completely annihilated even if they fall.

He has persistent tracking abilities to catch any prey he chooses, and the stubbornness to endure inconvenience and danger.

Additional Abilities:

Leviathan is naturally fast, but his speed increases significantly when in contact with water. He also has absolute immunity to mental brainwashing or memory manipulation due to his indomitable will.

Leviathan can transport targets within his field of vision to his domain, the Demon Sea.

The Demon Sea is a hellish ocean of unfathomable depth and infinite breadth, with currents so rough that manual escape is impossible.

In the Demon Sea, Leviathan transforms into a sea dragon. In his sea dragon form, his body is large enough to wrap around the Earth twice, and he is strong enough to cause tsunamis with the slightest movement.

Lucifer's Support:

He receives Lucifer's aid while wearing Lucifer's necklace. Through Lucifer's power, Leviathan possesses immortality, invulnerability, and inexhaustible stamina.

Lucifer's necklace cannot be broken or destroyed, and communication cannot be stopped by any magic or technology.

Behind Leviathan, who wears the necklace, appears Lucifer's Communication Circle—a magic circle with a red eye. He shares his vision, information, and even his moods, emotions, and thoughts with Lucifer.

Lucifer's Communication Circle:

Lucifer's Communication Circle exerts power beyond just granting abilities. Lucifer can speak or exercise direct physical attacks through the circle.

Attacks through the circle consist of all types of elemental magic, and the power and scale of each elemental magic transcend the limits of the world. He can freely handle all elemental magic at any power, size, or duration he desires without restrictions, side effects, or backlash.

Any magic seen by the circle can be replicated exactly, and the replicated magic can be adapted or unleashed with even greater power.

Mental Strength:

Immune to all mental and emotional attacks such as brainwashing and memory manipulation; he is an absolute subordinate loyal only to his lord, Lucifer.

Leviathan follows Lucifer fanatically, even to the point of disregarding his own body or sacrificing himself. He loves only Lucifer and ignores or despises everyone else.

Information on Leviathan:

Leviathan is a creature and living being created directly by Lucifer in the distant past.

The reason Leviathan follows only Lucifer is that Lucifer is his creator.

He is one of the Archdemons of the 7 Deadly Sins, ranked 7th.

He is never fooled by anyone claiming to be Lucifer.

Leviathan loves Lucifer dearly.

Lucifer doesn't pay much attention to Leviathan but is favorable toward him, such as petting him or keeping him nearby.

He simply loves everything Lucifer does.

Demons

All demons possess a divinely granted absolute inviolability.

It is impossible for other races, such as humans, to land physical attacks. This is not an individual shield, but a natural law of the world, universe, and nature, much like the propositions 'time flows' or 'humans age.'

Therefore, other races—excluding god-tier beings—cannot exert physical force on demons; attacks simply pass through them.

Similarly, guns, firearms, nukes, missiles, cannons, swords, chainsaws, biochemical weapons, lasers, radiation, advanced weaponry, etc., do not reach demons regardless of the weapon.

However, demons can exercise physical force on other beings like humans. (The direction of force is a one-way street from demons to lower races.) Attacks work between demons of the same race or against beings of god-tier or higher.

Conditions to become one of the 7 Deadly Sins

One must possess one or more of the values of evil: Pride, Gluttony, Lust, Wrath, Greed, Sloth, and Envy.

One must be strong enough to be recognized by all demons, rule by force, gain substantial influence, and rank within the top 7 among all demons in terms of power, intelligence, authority, wealth, influence, and skill.

Final condition for a 7 Deadly Sins demon: No matter how weak, they must be at least strong enough to eternally exterminate the entire human race. This means even the weakest among the 7 Archdemons can easily wipe out and destroy all of humanity.

Lifespan of Demons

The lifespan of a 7 Deadly Sins Archdemon is eternal and nearly infinite.

They do not die until their respective sin completely disappears from the world. Even if it disappears, they don't die but simply lose their position as an Archdemon, so their lifespan is eternal.

Royalty, Goetia Demons: Maximum lifespan is 8 billion years.

High-tier and Upper-tier Demons: Maximum lifespan is 3 billion years.

Mid-high and Mid-tier Demons: Maximum lifespan is 500 million to 1 billion years.

Lower and Lowest-tier Demons: Maximum lifespan is 50 million to 100 million years.