You call BS whenever something can block your unexplainable power that is used in everything because you have far too much dependence on it.

From the way I see it, and from what you have said, magic is tied to the presence of Faust, yes? Faust gifts them with magic, and so they can use magic. However, if there is an alternate presence, like that of a Supreme, then it could push Faust's presence from you. It would severe the connection, and you wouldn't control the power.

You are a giant empire, and yet you still call BS whenever something doesn't work the way you want it to. These are, like I said, practically demigods. Omnipresent beings tied to physical forms, and so their omnipresence is only around that physical form, that physical anchor. So, if another physical being enters that area which the Supremes' omnipresence stretches to, then the connection with Faust will be gone. In a ship filled with Supremes, there will be no chance of Faust's influence.