Board Thread:Spoilers!/@comment-5899967-20170224112659/@comment-25926288-20170224125318

Walecs wrote: "The darkest soul we’ve been teasing for six years" The Black Fairy has only been mentioned in season 3, thus she's been teased for 3 years at max. Technically, she's apparently also the one that gave Snow the Dark Fairy dust (so, she been around since season 1)