章 521: Boom!

Half an hour later, hundreds of materials were all set. Li Yao and Huangpu Shiyi each stood on one side of the warehouse with an operation desk in front of them. Below their feet were large defense rune arrays that were emitting gold brilliance. They constituted translucent circular walls around them.

Black Stone, White Dew, and the other spectators all hid themselves in a strengthened room in a corner of the warehouse.

The refinement of crystal bombs was not something to be underestimated. Although both of them were experts, nobody could guarantee that their products would not explode half way through their work.

"The first round, twenty-seven materials, ten minutes. It's just a warm-up!"

"Come on!"

A queer smile popped up on Huangpu Shiyi's face. His eyes suddenly bulged. Wrinkles appeared in the corner of his eyes. Taking a deep breath, he extended his withered hands and opened his palm!