The Chronolith of Astral Alignment

The vault hums with the resonance of the astral sea, its walls lined with floating rings of etched mithral that circle a central core of pure light. Tiny motes of starlight drift through the air, carrying the faint scent of ozone and ancient parchment. The floor is a polished obsidian mosaic depicting a map of the Inner and Outer Planes, and a bronze pedestal at the room center holds a series of interlocking rings with slots for glass lenses. Three massive stone statues of celestial observers stand in the corners, their empty hands outstretched as if waiting for an offering or a tool.