Formation groups and magic formations were different. Magic formations could be flat. If you used some special materials and drew them on the ground, the magic formation could also run. However, formation groups were different. Formation groups were generally three-dimensional and divided into layers. Whether it was a formation group made from real formation talismans or a formation group made from the void formation technique, they all had one characteristic, which was that a formation group was composed of many magic formations stacked together.
Overlapping multiple arrays required a certain amount of space. If you wanted to overlap them on a single plane, that definitely wouldn't work. You would need a certain amount of space.
However, it was impossible to Pierce multiple layers of arrays on a person's skin using the tattoo method. It was impossible to do that. The array groups had to be clearly layered.
