```
The next morning.
In the living room, Mathilda Ward looked at the black bottle on the coffee table with a questioning gaze turned towards Jack Clark.
Jack Clark, wearing sunglasses, said calmly, "Back on the Southern Battlefield, I killed a Purgatory Demon named Mikus and seized a storage bag from him."
"Inside were many various things, useful or not, such as Magic Crystals that only the Purgatory Demon Race can use, some High-Order Extraordinary Materials, and the like."
"I used the useful Transcendent Materials to forge my Battle Armor and weapons, some were exchanged with the school, and aside from those, there was also a piece of jade."
"The jade was quite peculiar, extremely hard, and even I couldn't destroy it. It didn't seem like a Transcendent mineral, yet it emitted a subtle aura, so I kept it."
"Last night, for some unknown reason, several cracks appeared on the surface of the jade, making it extremely fragile, as if some kind of seal had broken."