The power of the Annihilation Realm King's Fist was indeed formidable, but even with the strength of Perfect Regeneration overcoming one of its drawbacks, there was still a significant weakness: the time it took to gather the power was simply too long.
Though in the eyes of ordinary gods, this speed wouldn't seem too slow, for the enemies Sterl was currently facing, the activation time was far too slow. With such a long time to gather power, his enemies had plenty of time to respond.
But there was no way around it. The concept behind the Annihilation Realm King's Fist was to accumulate everything and then explode with overwhelming force, so the lengthy gathering time was unavoidable.
So, Sterl decided to simplify things and use a more basic version of the Annihilation Fist to engage in a fast-paced battle with the monster. Every now and then, when he broke through the monster's defenses, he could still deal some damage.