3. DEMON HIERARCHY
There are different views and regarding what kind of demons are the strongest, it depends on the writer’s version. But the oldest and the ancient are the White-eyed demons. The are the chief of the demon staff. This kind includes Lilith and Alastair. Then comes the first generation of demons created after the White eyed ones. After the king of hell, the yellow-eyed or the Princes of Hell are the rightful owners. These kind have the power of telekinesis, they can control dreams, manipulate elements. The four Princes of Hell were Azazel, Ramiel, Asmodeus, and Dagon. Then we have the Knight of Hell, although they are the black eyed demons, but they are very elite and powerful as they were trained by Cain itself. They can only be killed using the first blade. Another category of demons is the Red-eyed demons who are known popularly as the demons of the crossroads. They are way powerful than the ordinary black-eyed ones. Their job is to make deals with the humans in exchange for their souls which they collect at a later point.
2. CURING A DEMON
It is well known that a person can become a demon when his soul is tortured way beyond the limit. A member of the Men of Letters named Father Max Thompson tried finding the way to cure a demon. He ultimately learned that the ritual must be performed on a sacred ground and one must use purified blood in the ritual. After he used his own blood and injected it into a demon for eight times hourly apart, he managed to cure the demon using the exorcism. Sam would later use the same method to cure Dean.
1. DEMONIC POSSESSION
Demons don’t require the consent of a human vessel in order to possess them. People who are anxious, scared, nervous are more prone to demonic possession. If one uses the word Christo aka God then the demon present inside a human will flinch revealing his black demonic eyes. If the human vessel is gagged then the demon possessing him cannot leave or escape. We have seen Meg and Ruby being gagged on different occasions when they were tortured. While being in a vessel, if they are subjected to torture then they will experience all the pain and torment. Despite demons believed to be evil, they are also capable of doing good acts such as when Crowley and Meg sacrificed themselves for the Winchesters.