C2209 Inspect the Luggage

"Is this thing really a 'Spatiotemporal Secret Key'? Then what is this 'Spatiotemporal Secret Key' exactly?" Alvin looked at the ordinary stone in his hand and wondered.

Although Alvin knew that the spies of the Flaming Wind Country were looking for a gem called the "Spatiotemporal Secret Key", he did not know what the gem looked like, nor did he know what the use of the gem was