The Stone Juggernaut doesn't seem to make any sense. If it can't go through a creature's space unless it's prone, is it what? Stopped? If it does go through their space due to the target being prone does it then just stop at the next person because it can't make another attack that turn? Seems to me that the idea is for it to barrel over all PC's in its movement range and yet that's not reflected in its stats or abilities.