Chapter 1327
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Because of the characteristic of his enemy, Xin Ja knew that it would be impossible for him to hurt it without exposing his ability to use runes. And once that is exposed, then those people outside would become wary of him, and then they would change something in the rules.
So he could only use such a method as to combine a couple of exploding rune talismans coupled with a done rune which generates a compression array that would compress the explosion several folds until it would produce a more powerful blast.
Xin Ja has already done such a thing before so the use of runes to compress the Ki energy and release it at one time is not new.
With the explosion from within the body of the beast, its huge body was torn into sheaves of flesh and blood.