The following account was recorded in the agent's log during your transmission: Tendrils of frost creep across the polished stone face of an ancient, subterranean Mithraeum, its alcoves lit by an otherworldly, soft blue radiance that seems to emanate from the crystalline structures embedded in the stone itself. Uh, the air's heavy with the scent of damp earth and frankincense, and there's this low, vibrating hum that seems to be synchronizing with the shifting patterns of frost. A rivulet of water is flowing uphill along the base of the stone, disappearing into a small, intricately carved portal that seems to lead directly into the solid rock face.