This is actually the seed of a really interesting idea! What if we made a variation of Eye of the Beholder which, instead of targeting an item and the concept of
value, targeted a person(/group) and the concepts of
danger/importance? So instead of an illusion which makes something look cheap or valuable, we get an illusion which makes a person look harmless or dangerous. Normal knights could look like light cavalry scouts or terrifying demigryph riders, capable but unexceptional soldiers could look like champions or terrified conscripts, an Elector Count could be concealed within the ranks, and so forth. This seems like a very solid piece of logical development that plays directly into our Fog of War trait. It could be developed into either a battle magic scale spell that gets used on entire units, or a much lesser scale spell targeting a single individual at a time.
@BoneyM, a review of this spell idea?