From these deep beliefs pertaining to death and the soul derives the invention of the Slavic concept of vampir. A vampire is the manifestation of an unclean spirit possessing a decomposing body. This undead creature needs the blood of the living to sustain its body's existence and is considered to be vengeful and jealous towards the living.[109] Although this concept of vampire exists in slightly different forms throughout Slavic countries and some of their non-Slavic neighbours, it is possible to trace the development of vampire belief to Slavic spiritualism preceding Christianity in Slavic regions.