Fruit of life

The demons use human lives to grow the fruit of life, and by offering three of them, the Demon King will be revived. The number of humans needed to produce it is in the tens of thousands, so the larger the city, the more likely it is to be targeted. Each human's soul has its own degree of strength. For instance, Hero Epona, her soul alone is enough for one fruit, but if we are talking about ordinary humans, it would take fifty thousand of their souls.