The novel was about this guy who had buys a cursed pheonix pin for his girlfriend and dies. he reincarnates into another world and the pheonix lives in his body with him. The MC is slowly unlocking access to previous incarnations of himself and his personality changes a little every time he combines with a past self. One version of himself was a tiger demon, one was a monk passifist who could control people's minds, another was a young female shaman who was embroiled in village wars before she died, another was a cultivator on the run from the entire universe who studied the stars and fell in love with a fox demon who later discovers the mc. I think the main character lived in a world that was stolen away from its original owners and its 4 princes and princessess where trapped in bobbles and bannished to different dimensions and the MC just happened to find the bobble of the pheonix and freed him by dieing.