A member of The Dream include any people who live between dimensions and..., these beautiful creatures resemble trees. They have control over plant-life, and – like all members of the Dream – feed off human dreams in sleep. (Don’t worry. That part benefits us.) Closely related to both A member of The Dream, these beautiful creatures resemble wa... and Sylphs.
What makes them stand out is they’re slightly more awake and aware than most people of The Dream. You could actually have a conversation with one, and that’s saying a lot.
Note: this applies to the current surviving Dryads. There used to be a portion of their race that fell into the Guardians category, but they were all destroyed in the First War.