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That huge fella...

Name: Behemoth
Origin: Chrome Shelled Regios
Gender: Male (in the sense it doesn't create offsprings like the female-type Filth Monsters do)
Classification: Aged Phase Filth Monster, Collective Organism of Cells
Age: Unknown
Powers and Abilities: Super strength, speed and stamina, regeneration (low-high), can drill underground at high speeds, its body is made out of countless individual cells with their own will, able to shapeshift for various purposes, can extend countless antennae to spread out, surround his enemies or attack, able to make any of its body parts explode and rain deadly shrapnel to buy enough time to regenerate, can dig tunnels underground
Weaknesses: Cannot regenerate its lost cells (at least not in the heat of intense combat), will die if Behemoth's entire body is vaporized (well, that's hardly a weakness)
Destructive Capacity: Island level, automatically generates explosions with strength directly proportional to the body mass it loses
Range: Giant melee range (which means a few kilometers here), its tentacles can reach for 10+ kilometers
Speed: Unknown, sub-relativistic reactions/combat speed (able to fight Heavens Blade Successors like Layfon, Lintence and Savaris)
Durability: Unknown (its flesh isn't particularly durable... by Heavens Blade standards), albeit due to its regen Behemoth requires continent level firepower to be taken down at once (Layfon, Lintence and Savaris had to use their Kei at maximum output for 10 seconds to ultimately destroy the creature.)
Lifting Strength: Class T due to its size (it is like a living mountain, being even taller than Grendan) and powerscaling (was physically stronger than Heavens Blade Successors)
Striking Strength: Likely Class EJ with physical attacks (can threaten to kill Heavens Blade Successors with them), the tentacles are potentially Class TJ or above
Stamina: Extremely large (fought 3 Heavens Blade Successors for 3 days without any signs of tiring out)
Standard Equipment: None
Intelligence: Cunning and very adaptive. Managed to invent newer and better methods to counter the Heavens Blades' continuous assault over the course of battle.
Notable Attacks/Techniques:

Notable OBD Victories:

Notable OBD Losses:

Other: Behemoth was described as a creature similar to a mud doll in shape. It was as large as Grendan in height and said to be collective of countless individual cells instead of a single being. Not to be confused with the Saint Seiya: The Lost Canvas character with a similar name.