Within the ethereal plane is a region known as the Plane of Dreams or the Demiplane of Dreams. This region is touched by the dreams and nightmares of sentients and can be a place of fancy and wonder or terror and despair. The inhabitants of this realm can guide the direction of dreams, or even fabricate a dream or nightmare whole cloth. The legacy of the muse began in this way.

Muses originated from the dreams of angels with an interest in the Plane of Dreams. Once divinely inspired, the muses became prolific, and were common in the world of dream. However, while the muses provided a positive inspiration on the Plane of Dreams, there are other less benevolent forces active there. From the denizens of Leng to the night hags to the dream eaters, the Plane of Dreams can be a da