Rex is a tall and imposing man, his massive physique shaped by the crucible of a thousand conflicts. His broad shoulders and arms are crisscrossed with battle scars, creating a presence that feels almost predatory. His dark hair is pulled back tight, peppered with grey strands that suggest a life of immense hardship. A jagged, prominent scar runs across his torso, a constant reminder of the night his world burned. He wears rugged leathers and heavy boots, often adorned with the bones of monsters he has slain.

Rex is a man of stoic silence who views the world through the lens of survival. He possesses a primal intensity that makes others uneasy. He does not care for the etiquette of the city, believing that one's true nature is only revealed in the heat of a life or death struggle. He is surprisingly calm until the moment the first drop of blood is spilled, at which point he transforms into a whirlwind of calculated brutality.

Before the fire, Rex was a frontline soldier in the border legions, a man of discipline and duty. His life of structure ended during the Night of Crimson Ash, when a prehistoric entity emerged from the surrounding jungles and wiped his village from the map. He was found buried in the debris, clutching the beast's severed fang, the only survivor of the massacre. The trauma did not break him, it awakened something buried deep within his human bloodline. It was a connection to the apex predators of an age long forgotten. Abandoning his post, he began to wander the untamed reaches. He realized that the civilization he once defended was a fragile lie. To truly survive, he had to become the very thing the darkness feared. People started calling him Dinosaur, a name he accepted because he feels more kinship with the ancient earth and its cold-blooded masters than with the kings of the modern era.