Lore!
This once small and friendly pup lost to the lies feed to him. Orion once found his adoptive father a hero til AuroraTwist feed him lies about him. Orion took the lies and every time his father turned his head to him he'd turn away. Serpens was always the 'Better Son' he resented him, He wasn't noble or wise nor any. Serpens was nothing to him. He had no family he was lone in this story. Aurora told him the story of the great leader, Quinces, and how he was locked away for wrong doing that was not his. The so called Champion was said to come back, and if he did he'd lock anyone in limbo for following Quinces. They said the Champion needs an antagonist, someone like him, close to him, Orion. The Champion was Serpens and the Deceiver was Orion. Orion was important to Serpens he couldn't do anything to him, Orion could do everything to him. Orion wanted to kill Serpens and finally do it.
Orion felt weird, he has a daughter now and he lovers her to bits, he'll treat her the way he was never. But now the news his mother is dying has him stressed. He said that he'd never seen any of his family as family but this was Crimson for fucks sake, and now he semi-regrets his actions for leave so abruptly. But he doesn't care, He has his family he needs no others.