Gradim Nava

Carrion's half-brother who fled the Beast Kingdom after failing to rebel against his father and brother centuries ago. He is the leader of the Demon Beast Corps and uses Beast Fusion.

Gradim is known as Beast King (魔獣王デモン・ビースト・キング).

Story
Empire's Invasion Arc Having witnessed the numbers and rank of the demons which Rimuru Tempest summons to battle the Empire's forces Beast King Gradim issued the Secret Command giving his subordinates permission to use the Medical Skill Beast Fusion.

Like Gradim, there were corps members who successfully fused and completed the process. These members consequently attained new powers and became stronger. These perfectly compatible individuals made up less than 1% among the entire corps. They were called Chimera Knights and were the aides of Beast King Gradim.

The order that Gradim issued, was akin to a death sentence for the Beast Corps troops. If there were unable to attain power now, they will simply end up as fodder for the demons. It was a cold, but pragmatic order. And the troops swiftly followed it.

They had prior knowledge to the risks of using Medical Skill Beast Fusion and knew of the high mortality rate. But because they had absolute faith in Beast King Gradim, they followed the order without hesitation.

Skills
Starving Ones: This skill, bestowed upon Harkon's subordinates, allows them to eat anything and everything in sight. One of the effects of the unique skill known as Starved. They were as much one swarm as they were an individual. Again, quite similar to the shared evolution of the Direwolves. Although they could not obtain all the abilities of those that ate, they could still acquire some of their special features.

Getsuei no Ou Tsukuyomi」
 * Provide: Harkon gains the ability to obtain Skills from monsters linked to his soul. The original owner of the provided Skill will not lose the Skill because of this.
 * Receive: Grants part of Harkon's abilities to monsters under his influence or linked to his soul.
 * Shadow Moon Lord Tsukuyomi 「月影之王 ツクヨミ
 * Shadow Moon Lord Tsukuyomi 「月影之王 ツクヨミ
 * Complete control over the law of causality
 * In a time stopped world, where all other phenomenon have ceased, the user's will is given absolute priority.
 * In a moving world, where there are many phenomenon in motion, the user's will influences all outcomes, but is not absolute.

Medical Skill Beast Fusion: This skill fused the Magic Beast and it's handler together. Letting a human attain the power of a Demon Beast; a forbidden power. The reason it was called a forbidden skill, was because it became impossible for the individual who activated it to cancel the effects. The drug used for the skill had to be surgically removed in a facility with the appropriate tools. Through the fusion of the handler and his partner, a warrior that surpassed the original concept would be born.

Of the 30,000 members of the Magic Beast Corps that used Medical Skill Beast Fusion: It resulted in a fairly large loss in numbers.
 * 7,750 turned into complete Demon Beasts. They became as if one being, able to move quickly on all fours and get a boost of strength.
 * 4,000 into berserk Lycanthropes.
 * 2,300 turned into Demonic-Beastmen. They displayed the ability to transform themselves into a more beastly form.
 * 1,000 into Beast-Man Sages.
 * 450 turned into Chimera Knights. The Chimera Knights obtained the Unique skill Bodily Manipulation.
 * 15,500 of the original 30,000 troops lived. Of them only 3,750 retained coherent thought, and 1,450 of them retained their humanity.

However, there were corps members who successfully fused and completed the process. These members consequently attained new powers and became stronger. These perfectly compatible individuals made up less than 1% among the entire corps. They were called Chimera Knights and were the direct subordinates of Beast King Gradim.

Unique Skills
Beast Transformation: Gradim can perform Beast Transformation which further increases his abilities and allows him to fight within a barrier designed to weaken hi.
 * Royal Beast (百獣化): Gradim possess the unique skill that allows him to transform himself into a chimera like beast form that encompasses all main beastman types, being an evolved version of the Beast Transformation skill common to the Beastman race.

Special Moves
Envious King Leviathan「嫉妬之王 レヴィアタン, Shitto no Ou Reviatan」is the Ultimate Skill that degrades abilities used against the wielder.

Patience King Gabriel「忍耐之王 ガブリエル, Nintai no Ou Gaburieru」is the Ultimate Skill used by Harkon's subordinate, Gradim. It's ability is absolute defensive power by freezing (momentum stopping) anything. Fixation is Gabriel's essence. It has the inherent ability to decelerate, fundamentally opposite "Charity King" Raguel's Acceleration.
 * Deceleration: Slows down anything it is used on; this is the base ability from which all other uses are formed.
 * Air Wall (Atmospheric Prison Wall): Decelerates atmospheric molecules to create a wall.
 * Suspended World: Completely stop time; only being with powerful spatial-manipulation abilities can move under this effect, though a powerful enough being might be able to perceive the time stop.
 * Concept Fixation: Strengthens the structure of objects; this was used to reinforce the strength of Eurazania's new palace (City of the Forgotten Dragon) for transport.

Ice God Cthulhu「氷神 クトゥルフ, Hyoushin Kuturufu」A more powerful and efficient version of Gabriel fused with Leviathan. it was an ability that could freely reduce the energy composition of target's body.


 * It can exponentially reduce the thermal energy within the target, in other words, it is an ability that forcefully reduces kinetic momentum.
 * To a certain extent, it could reduce physical capabilities of beings, but going too far, would turn a body in ice. And, when the ability is at its greatest (probably -273,15 ºC / -459,67 ºF), it could reduce heat in the body, causing the body to freeze completely.

Mythical Beast Lord Bahamut 「幻獣之王 バハムート, Genjuu no Ou Bahamuuto」A more powerful and efficient version of Medical Skill Beast Fusion synthesized with Royal Beast.


 * Thought Acceleration


 * Gravity Control


 * Space Control


 * Multi-Layered Barrier

Relationships
The Magic Beast Corps handled various captured magic beasts: they breed, strengthened, and trained them. The cultivation of the Magic Beasts was processed through DNA analysis, the technology of the Other World that allowed the strong soldiers of the Empire to ride these beasts.

Those strong soldiers were said to have the blood of heroes who played an active part during the early days of the Empire in the times of old. Different from the Magic Remodeling technique that changes an ability-less person into a hero, they are born heroes having an overwhelming ability. A minor Corps with only 30,000 personnel. It was said that each one of them had the strength of 10,000 people while the Magic Beasts that they rode all had strength appropriate to A-Rank.

Medical Skill『Beast Fusion』was a skill that was developed by the team responsible for the analysis of Demon Beast DNA. The drug was distributed and kept on hand, so it was possible to activate it whenever necessary. But, usage is prohibited without the Secret Command from the corps leader (Gradim).


 * Battle Chimera: The Chimera Knights handled various Demon Beasts; they breed, strengthened, and trained them. *Demon Beasts: which were born from less compatible Magic Beast Corps soldiers, were seen as a type of weapon, having combat-oriented abilities.