I Raise Rats to Dominate the Elf World

[Pokémon fantasy, war, farming version] Why did the elves appear? In this world, elves and humans coexist, ancient times blend with modern times, and talents emerge in large numbers. Who is in charge? The emergence of elves has given rise to the warriors who have been silenced by firearms. Warriors can eat the flesh and blood of elves to absorb their essence... Then there are the knights who merge human and spirit into one body; musicians who combine with elves through music; evil masters who use elven hypnosis and the ability to penetrate people's hearts and fine layouts to cause trouble in the world; God's asylum seekers who give everything just to seek power... The buying, selling, killing, and eating of elves are legal, reasonable, and compliant in this world. After the protagonist's death, due to unknown reasons, he traveled back in time and inherited the farm where Rattata was raised, but fell into a whirlpool.