The temperature gradient between Fire and Water Magic was used to create thunderclouds, and by applying Wind and Earth Magic, he caused the Dragon Sword to be imbued with an electric charge. Following the principle that formed the basis for lightning rods, inescapable bolts of lightning struck Reinhard.
To escape the sheer speed of lightning, not even Reinhard was capable of such. The bolts of lightning, reminiscent of the speed of Cecilus’s swordsmanship that transcended human limits, a sight that had become all too familiar to him in the Empire, struck Reinhard chaotically.
Reinhard completely neutralized this with his Divine Protection of the Lightning Cloud, and although the lightning could not seize Reinhard, it did take hold of the Dragon Sword, causing the sword to become highly magnetized. –Arc 9, Chapter 14
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With the dao Aldebaran had created using Earth Magic, he had scraped off the scales of the Dragon―― these became bullets that were fired at lightning speed and struck the oxygen-deprived Reinhard.
No matter how fast Reinhard was, he could not outrun lightning. That was a fact that Aldebaran had already learned from his previous battles. –Arc 9, Chapter 14