War Against the Daeva of Chaos and Death

What is Daeva? Very macabre. Daeva is the name of a being from Persian mythology. All Daevas are invisible to the eye, it is possible to see only their shadow. In Persia, the Daevas are considered Gods. They are beings that move and walk through the worlds from the shadows. The mythology around them states that many are bestial and animalistic beings, in their wake they always leave a mark common to these entities. Daevas, according to legend, can be summoned through a demonic conjuration that requires great spiritual skill to dominate them. They are Zoroastrian shadow demons; they are wild and animalistic. Daevas need to be summoned to "attack" through an ancient and extremely macabre ritual, and this is a very risky job, as they tend to "attack" their summoner. No one knows their physical appearances, as they have not been seen for millennia. There is no way to "exterminate" them. For the summoner to lose control over them, all he has to do is destroy the ritual altar and the Daeva will turn against their summoner. Its conjuration is made using human blood and bones, but its weakness is light, as it is a demonic being from the shadows, whoever is attacked by one of these beasts can use a stick with intense light (enough to make a person blind, so close your eyes). The being was a Daeva together with some Djinn entity, so it had created a tangible body and was invoked in some ritual to reach them, some high magic ritual involving scorpions and it still had the alien factor. Let's say that the Daevas, like the angels, are extraterrestrial beings from other worlds, disembodied or not, on a mission on earth. In the case of rebellious angels, many are disembodied living trapped in the astral world.