C79 Voidling! Blackcrystal Essence!!

Gazing at the dark liquid, a smile flickered in Xing Yun's eyes.

Blackcrystal Essence!

Even the low-grade Blackcrystal was a crystal of exceptional rarity.

Within a few low-grade Blackcrystal Mines, there might even be Blackcrystal Essence, purer than the Blackcrystal itself, safeguarded by layers of pure Blackcrystal Mines.

The Blackcrystal Essence was an exceedingly rare treasure