"Wow, I never noticed I was that fast." Blake was surprised by the realization.
Stars act as mana storage and purifier, so when Blake underwent a fusion process that fused his 3 elements together, it gave him twice the amount of mana as those on the same level and increased the potency of mana, hence increasing the strength of his spells, but it had a drawback.
Blake needed a greater amount of energy to fill up his stars when compared to those with 2 elements, but what shocked Castiel and Brian was the fact that a gap of 4 stars was between them.
Unknown to them, it was all because of one of the space element's passive. The space element made a chronomancer more sensitive to his /her surroundings and that included mana, also it granted a default mana control greater than that of the other elements.
(AN: I hope you guys can picture how overpowered the space element is and why I limit it, especially the time authority.)