We're living in a ~medieval fantasy world, you can just imagine it as the tolkien universe.
The biggest castle in the kingdom is protected by a magic barrier and the king never left the castle. Let's take for fact that there is absolutely no way that a necromancer could curse the king because of that magic barrier, besides for one item which is explained later.
People are pretty confident that the magic barrier is safe, but somehow the king got very ill. The necromancer fooled everyone into thinking that he cursed the king.
Background for the illusion of the curse is that the necromancer wants to have a magic cube escorted to the king. The magic cube can pass the magic barrier, no matter what's the content... -> Content is the actual curse!
How could the necromancer achieve that?
Ways I thought of, but which don't satisfy me enough:
- King got a veeery rare illness so the healers in the castle (who are the absolutely best healers in the whole kingdom) couldn't find out what it is -> Don't like the idea that the healers couldn't figure out it's just an illness and not a curse
- Necromancer is manipulating the healers -> So he could also just manipulate the healers to kill the king, so this is not an option
- Necromancer poisened food which is gathered outside of the castle -> The king got people who taste the food, so there would be multiple people ill and everyone would know it came from the food and not from a curse
I highly prefer an answer which makes the necromancer do an action which leads to the king being weakened, but this option can only weaken him and not kill him. His ultimate goal is to kill him.
This is my first question here, hope that's a right kind of question and I'm looking forward for these awesome answers this community always provides!