The time which he had used the divinity was far too short. Even if that divinity was wondrous, Merlin did not think that it would increase his Mind Power by much. Based on his understanding, an increase of one time over would be considered decent.
With Merlin's Mind Power currently in the beginning stage of the Sixth-level, an increase of one time over would mean that he was still in the same state. The higher a Spell Caster's level was, the more amount of Mind Power needed for a breakthrough.
However, when Merlin looked at his current Mind Power, he was stupefied and somewhat incredulous. His current Mind Power was not at the beginning stage nor the middle stage but had reached the terrifying peak of the Sixth-level.
That was right, the peak of the Sixth-level, after a transformation that took merely an hour. Such colossal Mind Power was enough to construct numerous Fifth-level spells.