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Archdemon Empress Luna
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Luna's hands were sweaty, making the iron bars shine in places where her bloody palms had gripped them.
The obsidian walls were made of black iron, thick and hot to the touch as the demon fire, preventing any tortured screams from penetrating the next prison cell.
These obsidian walls were a requirement for all torture chambers and prisons in Hell specifically made for Archdemons.
It could also nullify Archdemon Magic.
Satan's prisoners wouldn't attempt a jailbreak, leaving them to rot.
In Luna's opinion, as one of Satan's prisoners, there was no need for her to attempt that.
Thousands of predatory legions would hunt her down in the end or it would be the one and only Grand Torturer chasing after her.
Luna wasn't the type to waste her time on a useless endeavor again.