Spying on the spy

Under the ground, inside the deep hole, a huge chunk of something shiny and sparkly like a crystal was jutting out and a middle-aged man and a younger woman were sitting near this crystal.

They had their eyes closed and their hands were placed on the crystal. Their chests visibly rose up and down indicative of deep breathing.

"This… This…" Duyi gulped and moved closer to observe the situation. 

Even at this distance, he could already feel the thick density of mana emanating from within that hole and as he tip-toed closer, his suspicions only became stronger.

But how could it be possible? How could such a big mana core exist? It almost looked like common metal ores!

When a small round ball of mana core gives so much strength and power, he couldn't even fathom the things one could possibly gain by absorbing that big ore!

Just how strong can one become by absorbing that much energy!