Excerpts from the official lore book that was used during development.

The Good Witch of Dreams. The daffodils that frame the shining sun, the smile of true kindness that eases all worries, the kiss on the forehead that follows dreamers to their waking world. She was powerful, able to cast her light and bring dreamers from the brink of their despair, a force of only good. She love all, but none more than the great and mighty Queen of Knightmares. Oh, she may look frightening, but the witch knew the warm heart that lay under the cold front. And besides, the shadows had their own allure.

When the Dream Eater took her heart, she used the last of her power to level the Marvelous Valley, and helped bring the beast to ruin. Sacrificing herself, she sealed her body within the Great Tree to keep him buried below. She didn’t know its roots would drink in his corruption. She didn’t know the soil would soak with him and spread his evil across the land.