User blog comment:Dragonmentor123/Is there a reason that Toothless might be the only night Fury?/@comment-4122072-20140825062415/@comment-4122072-20140826101441

Telepathy.

Like the Screaming Death, she is a 'once every 100 years' case. She has the incredible power to enter a dragon's mind, accessing their thoughts and memories. This will be useful in helping Toothless overcome his nightmares. Drago believes he has a plan for his Bewilderbeast to siphon her power, allowing him to control dragons again.

Also, Twilight doesn't come named, they name her that. It's simple, like Toothless, not cheesy!