It takes a soul.
The origin and destination of the soul have always been the subject of religion and philosophy. Different religions and cultures have unique ideas about where the soul comes from and where it belongs. In some religions, the soul is believed to be eternal, and from earth to heaven, from birth to death, the soul is constantly searching for salvation in reincarnation. In other cultures, the soul is seen as passing into another world after death or dissipating altogether.
The definition of the soul varies widely, but in general, it is a transcendental being considered the source of the human spirit, consciousness, emotions, and moral concepts. The soul is seen as something that gives human beings a special essence and value, enabling them to pursue higher levels of meaning and goals in the material world. On the one hand, the soul is considered to be transcendent and independent of the material world. On the other hand, the relationship between the soul and the body is considered to be interdependent.
The character and function of the soul are also varied. In many cultures, the soul is considered to be a being with special abilities, such as possession, channeling, sensing supernatural phenomena, and so on. In addition, the soul is also considered to be the carrier of moral and ethical ideas and the inner driving force of human behavior.
In fact, the soul is a consumable that the "gods" need, either as food or as energy. The higher the level of the soul, the higher the value, because you can not compare the soul of a cow with the soul of a human being, the former lack of learning and operation in the three-dimensional world, only the human soul, after 100 years of learning, can have perfect executive capacity for the basic needs of the "divine" needs.
"Gods" need mature souls to carry out the needs of reserves and counteroffensives - you can't ask them to come to the end themselves, after all, the reproduction of gods is too difficult, only with enough souls, they can continuously create conscious and autonomous execution of "warriors" for the battlefield needs in the distance, or for the needs of future wars.