So theory time. I think the reason we are seeing some of the past seasons big villains coming back is because the Anuk-ite.
I’m thinking that like in Lydia’s vision Derek, Scott, Stiles and who ever else are going to be turned to stone. But in being turned to stone they have to face their biggest fears in order to break out.
Stiles or Scott will face Void Stiles and Maybe Derek will face Jennifer, Kate and possibly Paige? Not saying that they are his biggest fears but kinda? Like he has no luck with women. Ethan might face his brothers Death at the hands of the Oni over and over?
Also maybe all you people rooting to see Allison again will get your wish and she’ll help from beyond the grave like she did before? Like help Scott break through the fear?
I just think it’s too late to introduce 3 or more big villains as anything other then fear inducing monsters they have to fight to survive.
But who knows.
(Plus look at the dark/dim hazy dream like lighting)