Developed Two-Way Foil at the Beginning, and Was Ridiculed by the Entire Network

The Demon Cave invades, and humanity is in danger. When everyone is hesitating. It is to use limited resources to improve personal cultivation. When it was still used to develop weapons. Zhang Ruoxuan stood up. He firmly believes that using all resources to develop weapons is the best solution. However, when everyone asked what kind of weapon it was. Zhang Ruoxuan said a term that no one has heard of, "two-way foil". Everyone laughed immediately when they heard it. Countless people even jeered. Two-way foil? No matter what ** thing, my ** is better than the two-way foil. However, when Zhang Ruoxuan successfully developed the two-way foil on his own. Everyone was scared to tears by the power of the two-way foil! Boss, please, don't use it! ....... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.