S2·E25 Storming Shadowhaunt

The magical universe enters its darkest hour as Bloom (who has turned evil) and Darkar(who has dumped the witches) combine powers to enter Realix. The Winx Club and warriors enter Shadowhaunt where they face Kerbog who has been yet again transformed into an extinct magical creature called an Octaceraton! The five fairies powers have no effect on it and when the Teachers show up to help. Is there any hope of saving Bloom?