This was a strategy spell created by Dorothy, who had gleaned inspiration from her extensive reading of various military texts and numerous strategy games she had played.
Well, to be honest, the homebody witch herself wasn't even sure if this thing counted as magic since the core of the formation was actually from some Qimen Dunjia techniques in her memories from her previous life.
Speaking of which, Dorothy herself found it a bit ridiculous. In her past life, she was just an ordinary homebody guy, not some professional Taoist. Her understanding of the Qimen Dunjia technique was limited to some popular science by novel writers and some basic information she had once looked up online out of curiosity.
Anyway, she had barely comprehended those mystical and obscure things in her previous life, and couldn't understand them at all. Back then, she had been an atheist, thinking these matters, put nicely, were cultural heritage, or, put bluntly, feudal superstition.