Board Thread:General Discussion/@comment-27079851-20161207035158/@comment-25375217-20170426163746

FrancisPaul wrote: It seems to have been off the table already, but I still like the theory that Black is Blue's serum version.

The Black Fairy was shown not to be vulnerable to Zelena's magic in a scene that looks a lot like Hyde being hit by magic and suffering no apparent damage. It would actually be nice if the Serum theme from S5 finale and the entire season 6 (with EQ) has a connection to the Black Fairy theme, that apparently came out of nowhere That is an interesting comparison. But combined with the fact that she's the only person we've ever seen poof the Dagger out of someone else's possession and the constant verbal reminders that she "practically created dark magic", I'd say it was just to make her seem more threatening than the gods, centuries-old darkness incarnate, practically invincible darkness incarnate, demons, and other various bad guys the heroes have defeated that sound much scarier than "fairy".