129 The Growing Youths

- Meanwhile in the secret chamber at Blue Flame Pavilion -

"How many kinds of materials have you tried?" Staring at the refinery furnace where spiritual essence light flashed, Li Haoran asked with a frown.

"Altogether 168 kinds," Chen Rong said while recording information into a jade slip. "The ordinary bronze and iron are not fit for engraving array formations. Among the available materials, the Wind Ripple Iron has the closest properties, but it's too hard and lacks flexibility..."

Each gun was an exquisite instrument, and the structure as well as the materials were meticulously selected. However, these materials were obviously not fit for the engravement of array formations.

Converting guns into spiritual artifacts that were used by cultivators was obviously not so simple.