Wanted Beast Tamer Immortal Lord

This is the ancient continent. A dangerous world where evil beasts are rampant. Humans worship huge evil beasts as gods. The evil beast is invulnerable to water and fire, and is called an "unkillable" monster. Even the five great immortal families who practice Ranfa are powerless against the invading evil beasts. In order to minimize the casualties of the people, the immortals advocated the sacrifice of three animals. I hope the evil beasts will stop causing trouble to the people after they are full. When everyone was at a loss to deal with the ravages of evil beasts, a girl who called herself the Beast Master appeared and reached the pinnacle of life with just a book called "Postpartum Care for Sows".