Thread:TsuchiNoKao/@comment-26544499-20200927173301/@comment-26544499-20201020120106

You probably can't and don't want to tweak the iim part. As I remember it, the function that sets its value exists to make sure that the Mouri House can attack somewhere owned by the Oda House. I don't know why that's actually a requirement, but you don't want to change that function and have to work your way through madness like having attackable vassals.