The Everfree is an old forest, a very old forest. There is an even old being living at it's heart. He was there before the princesses, before the ponies, before what came before. He was there before the forest itself and now old Tom Bombadil thinks it's about to leave.

Dusk the unicorn has one spell to his name and do to an incident it's a spell he cannot turn off. When the crystal heart is stolen he thinks his ability is the best hope of finding it. With his sister an ex caravan guard turned accountant and adopted changeling brother head to the Crystal Empire.

Story is set in s3 before magical mystery cure