This chapter explores the foundation of the society in Berlin in 1779, under the leadership of three figures: L.-J.-B-.P. Guyton de Morveau (known as “Brumore”), Thadeusz Grabianka, and Antoine-Joseph Pernety. Brumore played a pivotal role as the group’s oracle, practising arithmancy, or the “cabalistic science of numbers,” to provide members with divine advice from the so-called Holy Word. From the outset these oracular consultations were combined with a passion for alchemical experimentation. Moreover, this leading triumvirate soon created a lavish nine-day consecration ceremony that ranks as one of the most spectacular rites of its kind in the late eighteenth century. The remainder of the chapter focuses on the various endeavours undertaken by the society to concoct the philosophers’ stone in Berlin, Rheinsberg, and Podolia, as the three leaders soon dispersed to different locations. The chapter also explores the society’s early embrace of Swedenborgian doctrine, alongside the enthusiastic acceptance of a Podolian prophet from 1780.