I have an idea to make a castle map a little more interesting.
It would have to be a large map set up something like Feudal or Oasis with 80 territories or more, and in different spots are different neutrals which hold "spells".
For example:
- one of these special locations would make you roll 3 defensive dice so long as you held it
- one would allow you 4 offensive dice (with more than 4 armies on a territ) so long as you held it
- one would allow you to CHOOSE one of your territories to have 2 armies auto-deployed on it each turn
- one would cloak you in a non-fog game or in a fog game, illuminate your opponents for one round
- one would give you a card in a no-cards game when held at the end of a round, and then revert to neutral, or 2 cards in a cards game and then revert to neutral
- one would allow you to attack through 'impassable' borders
- one would allow you to deploy on neutrals
I don't think these should be put in each kingdom area, rather there should be enough of them and have them spread out enough that players will have to pick their battles and decide which spells they want, if any.
The reason for this being, one thing I don't like about castle maps is for the first few rounds, you're really just playing with dice, and if they're bad, you haven't really been beaten by anyone's strategy, just bad luck.