Leonel's gaze was frighteningly sharp, a suffocating coldness rolling off of his body in waves.
After he crossed the 10 kilometer mark, the difficulty shot up with every increment coming in sets of 10 kilometers.
The truth was that when one was on a planet, assuming a flat surface, 10 kilometers was already far enough for a target to disappear over the curvature of a normally sized planet. As such, even if you could aim further, it was useless unless you had methods to stand in the air.
Obviously, this trial wasn't set on a planet's surface and neither did the Void Palace have the curvature of a planet either. However, even so, the Void Palace had other limitations such as Anarchic Force that didn't allow targeting from so far away.