The area outside the cell's molten walls wasn't quite what Toz expected. But when he thought more deeply about it, he realized that it made more sense than keeping armed guards at the ready. With the security of the cell, it was pretty unlikely for anyone to break out, so having guards constantly on standby would only be a waste of resources. Instead, it would be a lot more efficient to increase the cell's defenses to prevent the prisoner from breaking out by themselves or with help from the outside.
The cell Toz was in when accompanied by the seal on his mana pool, would prevent the prisoner from escaping by themselves. And the area outside the cell prevented or slowed down anyone else from helping Toz break out.
The cell floated in the middle of a large empty space, only connected to the next layer of walls with a single stone bridge.
