Dreamstuff is the material which composes the pseudo-physical form of the Dreaming. It is highly malleable by nature, though conscious control of it is elusive.

The forms of fae is composed of dreamstuff, and changes according to their circumstance. Chimera are also made of dreamstuff, though their control over it is extremely limited. Regardless of the appearance of its dreamstuff form, the nature of a fae is apparent (with the sole exception of a disguised Pooka).