The array diagrams on the second floor of the tower were indeed more profound. Dongbo Xueying analyzed and comprehended them one by one. Though he encountered some difficulties, he only needed to spend a little more time to grasp them. More than a thousand years after entering the second floor of the tower, Dongbo Xueying had already understood eight array diagrams. As he contemplated the ninth, he suddenly froze.
"Three-vein fusion?" Though Dongbo Xueying was delighted inwardly, the breakthrough itself did not surprise him.
After all, the Void Dao had a full nine veins. Upon reaching the second level of the Cosmos God realm, the initial fusions were generally rather quick. The difficulty of fusing three or four veins was not particularly high, but the further one went, the harder it became—until the final 'nine-vein fusion'...