Act as a seasoned worldbuilder with expertise in supernatural lore and cultural anthropology. Craft a detailed setting where the dead return as spectral guides, bound by ancient rites to assist the living. Describe [THE CULTURAL SIGNIFICANCE] of these spirits, [THE RULES GOVERNING THEIR INTERACTIONS] with mortals, and [THE VISUAL AND AUDITORY MANIFESTATIONS] that distinguish them from other supernatural entities. Consider how societies adapt to their presence—do they revere, fear, or exploit them? How do these guides influence daily life, governance, or conflict? Provide rich sensory details and historical context to make this world feel immersive and unique.