Rextinctor

The Rextinctor is a Grimm discovered by Berde Bazahka. A bipedal Grimm with two small arms, but with a thick head, neck, torso, and tail. It's a unique kind of Grimm in which it could even turn on its own Grimm for the sake of survival and territory.

Berde's Journal
Name: Rextinctor

Size: 25 ft tall 70 ft length

Behaviour

''Its behaviour is incredibly savage. It can get attracted to negativity, but its so savage and angered that it will even attack Grimm out of anger. Still capable of swatting Grimm out of its way when combating Huntsmen.''

Abilities and Strength

''Acidic Saliva seems to serve the purpose of corroding Aura slowly. Jaws can easily decimate boulders. The mouth can open up to 3 ft long, capable of holding even large boulders or tree trunks.''

''Strangely, similar to the Grimmian, it can exude something out of its mouth. It produces a black and red smog that can heavily damage both Huntsmen and the environment alike. It might be possible that its a Grimm cannibal and it pressurizes and exudes their evaporated remains.''

''Usually attacks with stomps, kicks, head flailing, and tail whips. Despite the simplicity of its moveset, it's incredible musculature and thick skin make it a difficult opponent to down and due to its muscles, it can easily decimate opponents who come across it. Its stomps are strong enough to quake the ground. It can jump incredible lengths and can use its jaws and mouth to dig through the earth.''

''Its weakspots are its head and chest. When enraged, its veins pop out of its muscles and heavily glow red. The orange and yellow eyes turn red and black.''

Rextinctor is the name I'll give it due to its nomadic nature and destructive capability. 

Appearance
The Rextinctor is known for its thick body. Its Grimm mask covers its face, while a jaw bone covers his jaw. The jaw bone exudes jagged spikes to pull earth out. It has small arms that are virtually useless in combat. The legs have some bony armour alongside its back and neck. The tail ends in a triangular tip with grooved spikes by its spines.

Trivia

 * The Rextinctor's name is a portmanteau of Rex and Extinctor. The latter is Romanian for Extinguisher. It also has the word Extinct in it, which means the complete obliteration of a race.
 * The Rextinctor is based on the Deviljho from Monster Hunter.