Jia Xiu was obviously not trying to create a real nuclear weapon—the kind that used nuclear fission or fusion reactions to release immense energy, cause mass destruction, and leave widespread nuclear radiation contamination.
The reason was simple.
He did not know how.
Everything above was the entirety of his understanding of nuclear weapons.
As for the more specific principles, he knew absolutely nothing.
His knowledge of nuclear weapons consisted of Fat Man, Skinny, Little Boy, and appearing out of nowhere.
He did not understand the technical side in the slightest.
Besides, nuclear weapons might not necessarily work well against the Devil Race.
Compared to existing spells, they showed no particular advantage. The area a nuclear bomb could cover with its blast could also be covered by several legendary mages bombing together—and they could cover it several times over.
And beyond the blast's center, shockwaves, extreme heat, radiation, and the like might not affect the Devil Race at all.
They were simply too hard to kill. Not only was their vitality formidable, but they recovered quickly. Even if radiation could injure them, the damage it caused might not even exceed what they regenerated on their own.
As for high temperatures and such—
One could only say that the "hellish scene" after a nuclear explosion would be like returning home for the Devil Race.
Jia Xiu had borrowed the nuclear radiation symbol because he wanted to create a more effective kind of "radiation" specifically aimed at the Devil Race.
Come to think of it, the radiation symbol really was brilliantly designed: black and yellow, three fan-shaped segments, and a central circle. It was hard to say precisely which element looked dangerous, yet the whole thing simply gave people a sense of danger. Perhaps too many past works of fiction had instilled that