Though there was only a week, the exam posed little difficulty for Li Su.
Having fully understood nearly two million types of metal runes, he could basically grasp a first-level metal rune structure with no more than a brief glance at its diagram.
After all, first-level metal rune combinations, put plainly, still involved only a thousand runes and several hundred thousand possible combinations.
What was truly difficult were those hundred-thousand-metal-rune types.
Those were diagrams involving metal lifeforms at the Dao Daluo Realm. The variations within them were truly terrifying, practically infinite.
Of course, that was also why metal lifeforms so openly shared the metal runes related to their race's structures. Aside from unique beings with structures like metal lifeforms, other races could hardly defeat them merely by understanding rune formats. Even with only the most basic several hundred thousand combinations, metal lifeforms could continuously alter them in their hands, leaving their opponents unable to discern what was real and what was not.
After all, the thought structures of the two sides had been different from the very beginning. Biological individuals simply could not perform logical calculations at that speed.
Back to the exam.
The assessment for first-level apprentices was actually very simple.
One only needed to master three first-level metal rune structures. They did not even need to master all the variations—so long as they grasped over fifty percent, they passed.
At that level, one could basically serve as a repair technician for the lowest-grade metal lifeforms. If they were willing to become permanent employees, they could even obtain permanent residency rights in a metal city.
After all, metal cities were enormous. On Central Planet alone, there were more than thirty major cities over a hundred kilometers across, all requiring a large number of first-level repair apprentices.
Although metal lifeforms