The training room was on the second level, one floor above the hostage cells and two floors below the surface.

Obsidian had designed it himself. Not for combat training, the kind with weapons racks and impact pads that every pack maintained. This room had none of that. It had open floor space, good acoustics, and walls lined with the same material as the standing stones in the Sacred Grove, old quarried rock that conducted magic the way copper conducted heat.

He used it for observation.

He was there when they brought Sera and Luna in for the first session, standing at the far end of the room with his hands...