Erebus (meet as Emperor Hazzen) is the true overarching antagonist of Winx Club series.
he serves as unseen overarching antagonist of others seasons and the titular main antagonist of final season.
he is evil ancient tyrannical wizard and one of creators of magic universe and considered as God of Darkness. he is considered as king of demons and supreme emperor of dark gaia and founder and leader of dark order and monarca and controller of dragons,in past he killed all magics users and stealed his magics to disppear anyone magic,transfom all planets into darkness and destructeds and conquested magic universe secretly and nothing others villains finds out and try conquest after him,he and his former friend aine are creators of great dragon,he is responsable for events of series,he was manipulating others to plan to the judgement day. as mastermind using mastery of manipulation to all events,as tyrant wizard,his goal is makes magics disppears and recreate magic universe with his perfection with this he want regain his old divine powers stealing six godly cyrstals and he was reason of prophecy called apocalypse magic the final judgement of magix nigh-mentioned by mandragora and Ancestral Witches.
he was indirecty responsable for destruction of Diamond planet and for icy turned into evil witch and for creation of lord darkar,ancestrals witches and valtor,however he born as dark god causing evil in anyone,lord darkar,witches and anyone evil creatures magics are created by him in years ago,he was responsable for tragic fate of Bloom about his past,and maked a fate between winx and trix turned rivals,he and aine are reaction of connection of grear dragon between bloom and Valtor,he was mastermind behind for events of all story,hazzen is true master of lord darkar and ancestral witches, he is also master of ten members blood's generals, four demons of apocalypse,shaman witch and step father absusive of valtor, he is also arch-nemesis of Fairy Goddess,Aine and Bloom. and too as overall arch-nemesis of gods and winx