That marks a reasonable point. This would be Illyria's edict had they not sworn their oath. True form or no, their word still stands.

You speak truthfully, they admit. They stay and they will suffer. But that is my choice. They are not to be touched.

They are not operating under orders. Merely suggestions. It may be that any creature seeking to encroach on Illyria's domain will simply be opposed regardless of the brand of reason it divulges.