The strongest thing about the Divinity Slayer was not its attack power. Instead, it was the fact that this dao pattern harnessed the heaven and earth powers within a hundred-kilometer radius. In other words, Jiang Yi was able to use even his enemy's powers. When he was in the thunder formation—for example, he made use of the thunder and lightning forces within the array formation to become stronger. This made it easier for him to break the array as well.
Similarly, at that moment, he made use of the typhoon's powers. When the Divinity Slayer was activated, the typhoon slowed down. Three Fire Dragons formed from the heaven and earth powers carried with them a frightening aura as they charged toward the typhoon, breaking it completely.
Yet!