@PUBLIQclopAccountant
I’d doubt that. By the looks of it, all the spells in FiM have to be maintained as long as they are active, as is shown by Shining Armor’s shield spell and the acts of raising the sun and moon. You never see Celestia and Luna make the Sun and Moon move across the sky from east to west, it’s just up and down, which suggests that they would have to concentrate on doing it constantly. What I’m theorizing is that enchantments, or wards, or anything of the like doesn’t exist in their world. Also, I don’t know where you’re getting the info about wards from, but wouldn’t a ward of protection ward off protection? An in making the material weaker? Sorry, I might be overthinking this, but do you get what I mean? :)
Welcome to Canterlot, the least defensible city on a mountain, allowing for any and all invasivr forces to either mine underneath or blow up the city’s foundations, causing the entire thing to topple, killing everyone incapable of flight in the process