Wikipedia
A zduhać ( Cyrillic: здухаћ, ) and vetrovnjak in Serbian tradition, and a dragon man in Bulgarian, Macedonian and Serbian traditions, were men believed to have an inborn supernatural ability to protect their estate, village, or region against destructive weather conditions, such as storms, hail, or torrential rains. It was believed that the souls of these men could leave their bodies in sleep, to intercept and fight with demonic beings imagined as bringers of bad weather. Having defeated the demons and taken away the stormy clouds they brought, the protectors would return into their bodies and wake up tired.
Notions associated with the zduhać, vetrovnjak, and dragon man, respectively, are not identical. The dragon man fought against female demons called ala, which led hail clouds over fields to destroy crops, and consumed the fertility of the fields. The zduhaći (plural) of an area usually fought together against the attacking zduhaći of another area who were bringing a storm and hail clouds above their fields. The victorious zduhaći would loot the yield of all agricultural produce from the territory of their defeated foes, and take it to their own region. The vetrovnjak, recorded in parts of western Serbia, fought against a bringer of bad weather imagined as a black bird. The zduhaći are recorded in Montenegro, eastern Herzegovina, part of Bosnia, and the Sandžak region of south-western Serbia. The dragon men are recorded in eastern Serbia, Banat, western Bulgaria, and Macedonia.