but the Mind Flayer, being some cosmic horror, shouldn't have been killable
it isn't dead, its just Black Mist,the giant spider is just some body for it to control made by Vecna out of Demo's.
without Vecna, it lacks a coherent "brain" to do anything, it'll just be Black Mist in its Yellow Planet till it can send a shard of itself to another world and try again, its outlandish the cast did as much as they did considering the stakes at hand, but nothing cosmic was resolved, just Henry getting axed.
I still feel weird about the character, they present him just like all the kids he also fucked with, except because he was fucked with even HARDER than them by the Flayer, he's the hatesink, but all the cast who dealt with this shit should probably guess that he's just another thrall and is more like a rabid dog being put down than the evil mastermind, the show even spells it out for Will, but it goes nowhere, like alot of this story, like the black-ops military, they just fuckin vanish.
Stranger Things sort of went outside its own scope, Season 5 made the plot a fucking world ending threat where if the fuckin highschoolers fail, an Alien world will violently merge with ours and an evil Mist will brainfuck everyone on the planet, it doesn't jive.. its such scope creep that it really is baffling, and finally the Eleven "death" is retarded, they waste so much time preempting it and then well, she likely survives for naught to fuck off, and hopefully just like the series, it also fucks off, there's some gall having dangling plot threads to a 10 year running show that only belched out 5 seasons and only one and a half of them were good