NEW HEADCANON the reason every Daedric Prince has an Artifact in Skyrim is because they were all desperately hoping the Last Dragonborn would stumble ass-backwards onto it so they could have their soul (and the bragging rights that comes with it)
The sheep of Cyrodiil are always aware of what you do and keep track of your crimes and murders. They maintain an active tally of your current bounties but choose not to take action.
Will Bethesda ever do anything interesting with Peryite?
No. He is one of Bethesda's least favorite Princes, and as such, they have decided to pretend he doesn't exist. A shame, this one finds the Pits to be very interesting. Not exactly pleasant, so M'aiq does not visit often, but still interesting.