Wizard: The Flesh Knight with Innermost Depths

Darik is a transmigrator who became a bloodline knight before becoming a wizard, and the experience has inevitably affected him in one way or another. For instance, he has a habit of using himself as experimental material. Whenever he sees a different creature, he instinctively studies its muscles, organs, nerves, and everything else. Then he wonders how he can fit these precious assets inside his own body. After all, he's already taken in far too many brains and hearts, and he's running out of room. So one day, he decides he can't keep living without any rules. Things have to change: one heart in each arm is still far too roomy! For years, Darik has sought knowledge from the outside, then armed himself from within, stuffing one pulsing alien organ after another into his body, until no one has a richer interior than he does! At last, he has become invincible. Sitting atop an unnamed mountain, he feels the hearts pulsing vigorously throughout his body and suddenly wonders: "When did I stop being human?"