Su Xue was stacking Skills upon Skills on herself, giving herself great prowess beyond her Realm. But she was not yet done. In fact, she was far from it.
[Combative Immortality].
Sub Skill of [Combative Transcendence], that was obvious enough. It allowed the user to be undying against any opponent they fight of the same League, regardless of Level difference, as long as it was through combat.
And as a mastered Skill, and having its superior Skill also mastered, it skipped to the next League despite being an Extra Skill. In simple terms, as long as it was through combat, there was a high chance that Su Xue would not die even against Deity Emperors.
Of course the chance of death was still there, but slim. Overall, unless the Deity Emperor cast a Unique Skill themselves to kill her, she would be undying. But, what would its effects be when fused into her new form?
[Omnislayer].