And because he's been excommunicated there's certain places he can't go, so they have to make—take, like, the most dangerous, most steep route across the Alps.
Mary's position as a Catholic heir threatened Queen Elizabeth I's precarious position as Queen of England. England had been excommunicated by the Pope, inviting Catholics to dethrone her.
This was a smidge problematic, Crusading-wise, because Zara was a Christian city, but the Crusaders agreed to help, resulting in the Pope excommunicating both them and the Venetians.
The old fellow wants me to excommunicate the wheelwright, and then deliver him over to the civil arm—that is to say, to your grandfather—to be turned out of house and yard.
But that, many decided, was old enough to lead the faithful to the promised land — even though he had officially been excommunicated from the Mormon church before Smith died.
After John's old buddy wasn't voted in as Archbishop of Canterbury, he threw such an enormous hissy fit, he ended up getting excommunicated from the Catholic Church, giving people yet another reason to hate him.
So to excommunicate this demon out of our world and back to its own- at least temporarily- you're going to have to hit it with the only thing all demons can't stand, corporal or non-corporal: holy water.