"A Mind Heart, and an extremely strong Special Mind Heart at that!"
Merlin was very excited. He finally let the Mind Power morph and condense into a Mind Heart. After condensing the Mind Heart, his Mind Power could be substantially accumulated, not like before when he was unable to store any even after increasing it. Now, he could constantly increase his Mind Power level.
In general, Mind Power below the Seventh-level was all similar to each other. As a Six-Elemental Spell Caster, the Mind Power Merlin required far surpassed an ordinary Wizard's. Thus, even if he had peak Sixth-level Mind Power, it was impossible for him to construct all Fifth-level spells. He needed to transform his Mind Power to the Seventh-level.