kenjib said:
Does it need to be an entire setting, or would a creature and module be just as effective? How would you extrapolate this concept to the "big picture" of an entire setting -- especially when different peoples' microcosms begin to clash. Why are all of the king's subjects part of his nightmare?
I think any monsters created by the king's subconscious would be shadow creations. They would be quasi-real and therefore, would actually cause damage. But suppose the PC's kill the monster in a toe to toe battle? Would the monster really be destroyed if the king hasn't been dealt with also?
An adventure or a creature with the ability to create powerful illusions of this sort would work best, as opposed to a whole setting is my guess. I think the problem with a whole setting based on this idea might be that once the PC's have figured out that the source of the monsters is the subconscious mind of an NPC, it will take most of the mystery out of it in later adventures. Also, why would nobody else discover the source of all the trouble besides the PC's and do something about it? No, the more I think about it, it makes for a great adventure. A campaign based on the idea of destroying the creature responsible could work, but not a complete setting.