The Wicked Spear Arts was strong enough to cut through the Undead Pharaoh's corrupted domain. The Undead Pharaoh did not see that coming. It was certain that Michael would overestimate his technique's strength and fall victim to his baseless confidence. That was exactly what happened with the Undead Pharaoh instead.
He was too confident in the corrupted curse power and didn't expect that a Lesser Lifeform could cut through it. Not even Higher Lifeforms were capable of such a feat without the perfect Soultrait and Soul Technique. Yet, that was exactly what Michael did. The Aethyr Spear cut through the corrupted domain and struck the Undead Pharaoh's core.
The Undead Pharaoh responded quickly after noticing that Michael wasn't corrupted. He swung the Staff of Epos at Michael, only to see the corner of the youthful Awakened's lips curl upward. Michael smiled at the Undead Pharaoh as the Aethyr Spear impacted.