The power of a soul skill had a positive relationship with the power of the Soul Master, but the same applied for the restrictions of a soul skill.

All soul skills with prerequisites for usage were more powerful than normal soul skills, and the more restrictions and usage prerequisites a soul skill had, the more powerful it would be.

Angelic Blessing was a perfect example of this, and even Archangel's Dance was something that Yali could only use thrice a day.

Hence, these were two soul skills that she very rarely used.

The effect of Angelic Blessing was mass restoration, and it was the only mass restoration soul skill in the history of all Soul Masters.  [1]

However, when used on Evil Soul Masters, this mass restoration ability turned into mass destruction.

Archangel's Dance and Angelic Blessing was the most powerful soul skill combination that...