A Glimpse at A Mystery
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After Fuhrer let Apollo heal to his peak condition, he took Apollo to the center of the cave and had him release all control over his Demonic Anima. To be honest, the best way to train the Annihilations was to first grasp their underlying intent. However, since Apollo had the system, he was able to execute them by simply providing enough Demonic Anima.
Hence, why he was unable to maximize any of the Annihilations. In Fuhrer's eyes, this was unacceptable. To be the Monarch, one needed a mastery in all. If they possessed a weakness, they do one of two things to correct it.
First, ceaseless training until that technique became as easy as breathing. As the process was inscribed into one's being, the matter of it being a weakness would soon vanish. Furthermore, this would also boost the image of the Monarch in the eyes of others.