Kenji had discovered a fundamental limit to his magic: its range. At present, it extended in a radius of roughly fifteen meters around him. He simply could not channel his magical power beyond that point.
If he launched a Mizudama, for instance, it would sail through the air only to lose its magical buoyancy and plummet to the ground the moment it crossed that fifteen-meter threshold. Within that invisible sphere, he could guide it to a degree,
10