In the end, they would use water mines for the blast. Water was also a conductor, and the force of a water mine exploding was even greater than on land, with astonishing destructive power. In the past, people often used this method to blast fish—one explosion would wipe out a whole stretch.
It was rarely seen now, because it was somewhat dangerous. Besides, anyone who used this method to blast fish would surely be condemned as cruel and utterly devoid of morality. Others would not permit it either, so naturally, it vanished from sight.
Zhao Fu had no water mines, but he had two humanoid missiles: Binuoxiu and Kelahe. During the previous defensive battle, Zhao Fu had heard of their performance. One combined forbidden spell had blasted out a crater more than ten miles wide, frightening several million soldiers so badly they did not dare come within a single step.
This time, Zhao Fu intended to rely on them to seal that forbidden spell and create a forbidden-spell item. In other words, they would seal the power of the forbidden spell within a certain object, and once that object was thrown out, it would trigger the spell's power. It was somewhat similar to a magic scroll.
Zhao Fu used a high-purity energy crystal as the vessel. It was a diamond-shaped crystal one foot long, incredibly transparent, with many facets like a diamond that refracted light, making it look exceptionally beautiful.
This type of crystal could contain an utterly terrifying amount of power, and only it could serve as a vessel for a forbidden spell. Ordinary objects simply could not withstand the destructive power of a forbidden spell.
However, these crystals were also extremely expensive, costing ten thousand gold coins apiece.
Zhao Fu handed the crystals to Binuoxiu and Kelahe. Since