C441 Borrower kill ghost(part i)

In the next seven days, the four Mages and three female ghosts split into two groups, lurking near the nine main areas and laying down a formation where no high level ghosts could discover them. I have control over these formation, so I can activate them anytime …

Every time we set up the formation, the four of us Mages would use our full power, and then we would lose all our strength