Actually, he already had this ability before. The principle is not complicated: it involves manipulating energy to gather beneath his feet and then stepping up to ascend to the sky. However, it lacked practical usage before, coupled with his unfamiliarity, and today is the first time he's using it.
The sky was already covered by the Thunder Pool, making the whole world brightly lit.
Watching the struggling Yamata no Orochi below, Su Huan raised his hand to the sky, as if grabbing the ethereal blue firmament in his grasp and forcefully pulling it down!
Liquid lightning quickly enveloped his hand, extending at the end to form a spearhead, its tail stretching past his shoulder and connecting to the heavens.
The spear, over twenty meters long, with its thickest end spreading nearly a thousand meters across the sky.
An advanced version of the Spear of Divine Punishment.
