Three specters

A chamber with a polished obsidian floor reflecting cold blue, glowing arcane runes that cast dim, long shadows. Three crystal pillars stand in the room, each holding a translucent figure: a terrified apprentice, a wounded knight, and a chained mage. At the east side of the room, a heavy, sealed bronze door serves as the solitary exit. On the west side of the room, an archway leads further into the dark.