Although Tang Zhen didn't completely master these super runes, he could already use them. The difference was the amount of power that was unleashed when he used them.
With Tang Zhen's current strength, the destructive power produced by the symbols was still beneath his eyes. It was impossible for him to use it to deal with an enemy of the same level.
However, practice makes perfect for some things, and proper practice was necessary. Otherwise, how could one improve?
When it reached the level of proficiency, it could be used as the main means of attack, and could kill a strong enemy with a wave of the hand.
Tang Zhen had grasped many techniques. However, as his strength increased, many of the seemingly powerful techniques were no longer of much help to him.
Even on the foundation stone platform, there weren't any sector Lord level skills to exchange for, only because after reaching this level, things like spells were dispensable.