The frost dragon knew little of the chaotic void, and it spoke to Saleen in a rather nervous tone, "Steady yourself and never ever get near the edge of the crystal wall!"
Saleen, of course, knew that the closer he got to the edge of the crystal wall, the less probable he would be able to cast any spell.
While he had powers of level 15, he had no way of resisting the highest rules of the crystal wall system. Unless he possessed a mastery of rules powerful enough for him to stay unaffected by external interference, thus truly making a solid space of his own, there was no way he could stay totally unscathed if he went near the edge of that crystal wall.
