(To be modified later) Xu Huo's previous control over spatial rays was relatively one-sided. For example, the barriers he created generally didn't form closed shapes, and in most cases, he would expand the barrier area to achieve a similar effect, as with the ray blade.
Lady Palace can create a complete spatial enclosure and then layer it on top, compressing it enough to turn it into something like a bomb.
Once controlling the rays became easier, he could also create similar cubes. Not only cubes, but if he put in a little extra effort, he could even create irregular spheres, although cubes were relatively simple. Without resorting to "Cubic Space," he could stack about ten layers; within the "Cubic Space" range, the number could double, but spatial rays within the instrument's range were not very uniform, requiring more careful operation.