As a "light" version of Mountweazel, you could have a spell that doesn't conjure any actual physical features, but causes it to be generally believed that the feature (or lack) is there.
The caster could have armies encamped on paper to steer opposers away. They could conjure the common memory of a bridge, a town, or an oasis, to mislead others off the mark. They could cause a town to wither and die, or a king to lose his castle, by wiping it away. Go to Comment