The third floor of the Treasure Vault, within the enclosed space.
Casio's gaze subtly swept over the bronze key as he moved his footsteps to the right. His pace was neither rushed nor slow, resembling a collector selecting antiques, pausing to carefully observe any items of interest. It wasn't until half an hour later that Casio halted in front of the first item on the left. His gaze slowly drifting, he extended his hand to pick it up.
The first sensation was cold, like metal stored in an ice cellar. The second was its heavy weight, which, of course, referred to the key feeling unusually heavy for its relatively small size. He spread his palm open, and the skin instantly felt streams of cold emanating from the key. The bronze key radiated waves of chilling cold.
Casio slightly lowered his head, quickly scanning the key's overall shape.
