This "more or less" did not mean the relevant technology was more or less complete. Rather, it had reached the limits of the current stage and the current world.
No, more precisely, it had reached the Witch Tower's limits!
With the Witch Tower's combat capabilities, he could no longer carry out the next round of experiments and continue refining the data. Next, he would have to formally begin experiments with the Witch City.
Isaac could not help but furrow his brow. A Witch Tower and a Witch City were entirely different concepts. Though both were variants of mage towers and Floating Cities, and Witch Towers were far less difficult and costly to construct than mage towers, the same was not true for Witch Cities!
A Witch City was not like that!
As a great weapon comparable to a Floating City, nearly all of its specifications were rigid requirements. All Isaac had done was replace the relevant technologies and construction materials with witchcraft versions.
Using flesh and blood as the primary construction material was not a fixed requirement. Isaac simply had some foundation in that field already, and his technical reserves made it easy for him to acquire all kinds of flesh-and-blood materials.
But that did not mean the cost had gone down. On the contrary, the construction cost had actually increased!
That was because arcane-version materials possessed one enormous advantage over witchcraft-version materials: standards!
Arcane-related materials and technologies, whether high-level or low-level, all had clear standards. Those standards measured both their inherent value and the difficulty of obtaining them.
Many arcane materials and products could be mass-produced on assembly lines, so their prices had long since been driven down. Witchcraft was completely different. The same material could have different value in different fields!
Some materials with especially stringent requirements could