Tyrant

Tyrant was an extremely powerful Danger Beast, known for its possession of an incomparable life force so formidable that its flesh is still alive within the Teigu, "Demon Armor: Incursio".

History
Tyrant was a Dragon-Type Danger Beast that led a nomadic lifestyle, wandering the country in search of prey and devouring any living being that was unfortunate enough to encounter it. It was greatly feared as a dangerous and elusive foe, possessing the ability to evolve its body to adapt to its environment, ranging from scorching deserts to the coldest arctic tundras. During the reign of the first emperor, the dragon developed its stealth (invisibility) skill to elude his suppression forces. Even while being subjugated within a Teigu, it is still evolving in order to defeat stronger opponents; after changing owners from Bulat to Tatsumi, it is noted that Tyrant evolved to adapt to Tatsumi's emotions.

It can be assumed that Tyrant was an Ultra-Class beast.