Within a millionth of a second of the fission occurring, before the explosion could ascend, light had already been produced!
A massive amount of high-energy rays generated from the impact surged in all directions, which then struck the sturdy reflective layer.
According to the law of ellipses, any ray emitted from one focus, upon reflecting off the elliptical surface, will converge upon the other focus.
And at the other focus was precisely the fusion fuel!
A more terrifying force emerged within the core of the nuclear blast, devouring the firelight created by the fission, to then burst forth with a strength ten times greater!
...
Minutes earlier, on the empire's border, Tessis led twenty thousand imperial soldiers who, under the cover of Divine Arts, quietly set out, detoured through a valley, and then cautiously and fearfully stepped into this deadly region.