"We found it in the Orc Dungeon when we defeated the Orc Chieftain, the last floor boss.
It was a rather interesting battle, considering the orc was quite powerful for a Peak Sovereign," Kaizo said, noticing Kent's intrigue with the crystal he gave him.
In contrast to Kent's expression, the crystal in his hand was much more powerful than he let on. The crystal could store spiritual qi and purify it, allowing one to absorb it.
The fact that it purifies the stored energy is enough to show how invaluable it is. Then there's the part where he can absorb the stored energy.
The capacity is enough to make it valuable even when he becomes immortal.
Naturally, Gaia has already started sniffing it, knowing she could upgrade it. But even without upgrades, it's incredibly valuable.