User summary: Zigguratti: Cyberpunk Feudalism is a system-agnostic setting supplement, depicting a heavily stratified society living in a ziggurat, one of the few dozens technocratic arcologies protecting humanity after some undefined extinction-level climate events. Society in a ziggurat is organized in a caste system, with about 90% of the population belonging to the serfs caste, born indebted and bound to a lifetime of labor. Over them, the much smaller castes of knights and clerics are in charge respectively of police and administration duties. Finally, ruling over the ziggurat, the enigmatic, remote and invisible caste of the zigguratti.