User blog comment:RoyallyBella/Official Season 7 discussion blog/@comment-30891365-20161229220130/@comment-4795378-20161230034924

Brafilius didn't found the Legendarium. When he summon the fairy animals (Frostbite, Kemmy and Occula), he also unintentionally summon the Trix as those fairy animals are bonded/linked to each of the trio witches.