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Hercules's true strength was something Arthur couldn't ascertain.
But he did know of Hercules's magic.
The "Hand of Void," which was completed and altered by Hercules, was now Arthur's most convenient and practical secret technique, and he wondered what sort of form the "Stone Bullet Technique," also invented by Hercules, would take?
Indeed!
It was an invention!
Based on the records in Glyphic Language in the diary, Arthur confirmed this.
Upon seeing the "Stone Bullet Technique" that required only 1XP to learn, Arthur immediately chose to learn it.
