Xia Weiyi, at the lowest point of his life, seemed to have found redemption after being chosen by the "Deity."
He had never considered the possibility that Lofvis might be deceiving him; since this was his only hope, he dared not entertain that thought.
Thus, he became obsessed with bringing about the descent of Lofvis, using the knowledge from the Rune Book to twist Ning Zhewan into a monster, and planning the entire Arbiter video from start to finish.
This was his salvation, but it was also his revenge; in the depths of his heart, he wished for those seven thousand people to die, for them to become the nourishment that would bring the Deity into this world.
For that purpose, he was willing to sacrifice everything, including himself.
If the ritual had been completed step by step, maintaining the connection between the Rune Book and Lofvis, the descent of Lofvis would have been rapid, and no one could have stopped him.