Okay so, in my language arts class, my teacher would give us a latin phrase every week. One of them, was "modus operandi" (the meaning is "method of operating", but ignore that XD)
I figured, it sounded like a really cool spell. So here is my idea:
It's a lot like Expulso, however, this spell would push you a lot farther away, where as Expulso only pushes you a little bit. I am thinking maybe the tier would be tier 3 or 4 ish.