How is [x] used in medieval German?

[Aga Tentakulus]

Yeah but his Latin didn't make much sense  

To put it in a nutshell. "sis maris moris vis" are real words. You can turn that around however you want.

Here you have the examples for "sis", "maris" you already know, with "moris" there are 7 application possibilities and with "vis "4.
And now make something clever out of it.
I have checked it, asked KI and Google.

And now I ask you.