You have to fail to succeed
At the end of the day, it was a matter of fact that the dark energy blast had been powerful enough to cut through the walls and glasses of the skyscraper.
That meant the problems were either with the used materials, the defensive runic constellations which could be separated into the type of runic constellation and the combination in which they have been separated, or the runic solution that had been used.
"Maybe it's all three of them," Nial answered next to Master Crevian while pointing out something rather advantageous, "We didn't spend that much time trying to find out the perfect right materials, liquefied runic constellations, and runic solutions. I doubt that the Demihumans were that fast when they first created their Mega-cities.
As long as we work hard, we will definitely be able to create a fortress that can even defend against the attacks of Ancient Gods!"