Hey, hey, I started a thing:
https://www.webnovel.com/book/12140915105990405/The-Hunter's-Secret
Yohan's the best of the best when it came to monster hunting. Equipped with the secret, he and his carefree assistant track and challenge creatures of myth and legend. The fiercest, and deadliest, most vile monsters on the planet. There's nothing like getting the blood rushing.
Except for one thing. Why did they turn into girls after he defeated them? He wanted living death, not monster girls.