Thelema is a spiritual practice based on the works of Aleister Crowley whose most important work is the Book of Laws, considered canonical in the performance of many rituals. The present work analyses the most widespread ritual of the gnostic mass and attempts to isolate the basic features of thelemistic practice and identify the ways in which the practice informs the shape of thelema communities in the world and also to see what it brings to the individual adherents. To this end it is necessary to trace the historical genesis of Thelema, analyze the mythology and symbolism of the Mass and the phenomenon of occultism. As this type of research requires both the use of scholarship in anthropology of religion and insight into at least one thelemistic community, the author conducted an interview with four members of Universal Gnostic Church (Ecclesia Gnostica Universalis, i.e. EGNU) in Split, Croatia. Although the number of communities is growing throughout the world, one should note that this type of research is a novelty in the region and detailed scholarly studies are lacking. Hence this presents additional motivation to undertake research on this subject which will make a rare contribution to this area in anthropology, but also in other humanities.