Last portrait to Dust: An Elysian Tail.
Cassius is the last, and he was the hardest to draw, because his figure always stands in the shadows. The best source was the Steam Card about him and Jin (which is my background now on laptop
Not much is known about the origins of Cassius, until he became the first Royal Assassin. The only fact, that he showed remarkable talent in swordfighting-skills. It is unknown, where he learned his fighting technique, but with it, he became the best swordsman in the land. He became close friend of General Gaius, and aided him in his campaign against the Moobbloods. His last success was the massacre in Zeplich village, where he personaly killed most of the villagers and hiding moonblood families. Here, he was confronted by a farmer-boy, Jin, who wanted to take vengeance for his parents. Cassius was sure, that the boy is unskilled and can't fight with him, so mocked him. His pride was his undoing, because Jin managed to mortally wound him, before Cassius killed him.
Cassius is fierce, brutal, and merciless. He is not afraid to kill even women and children, if they stand in the way of his success. His only goal is to get the job done, no matter the cost.
He is the "Dark-part" of Dust's soul.