STRANGER THINGS SEASON 4 SPOILERS!
Vecna's role in S4
In the upcoming season of Stranger Things, we will be introduced to our new big bad; Vecna. Vecna, like the previous monsters, is inspired by its DnD counterpart but also Pennywise, Freddy Krueger and Pinhead. Using the evidence provided through interviews, trailer clips and the new spoiler full monopoly game, I'll be aiming to theorise Vecna's powers, their motivation and try to debunk some popular Vecna myths. I'll also be talking about how this will impact characters like Max Mayfield and Victor Creel.
But first of all, who is Vecna? In DnD, Vecna is an undead God. He is loves collecting secrets so he can use them to manipulate people. He believes that the true key to taking over realms isn't entirely through violence but through these secrets. Unlike other villains, he is highly intelligent and calculated. Vecna used to be a human but ascended to godhood after dying, leaving behind only one of his eyes and his left hand. Stranger Things will obviously make liberties in this description as they have done with previous DnD characters, but I believe the main points still stand; Vecna is intelligent and unlike other villains will use psychological manipulation to bring down our (vulnerable and traumatized) characters. Like in DnD, Vecna will be an ex-human although it seems like he started off with good intentions but was warped by the Upside Down. Some people believe Vecna is '001', meaning they were experimented on like Eleven and Kali but got trapped in the Upside Down which sounds cool, but might be a bit of a plot hole since it seemed like Hawkins National Lab wasn't aware of the Upside Down before Eleven. They could still do that, but I don't know if they would as they'd have to explain some stuff away.
So what will his powers be? I don't doubt Vecna will be highly physically powered, but what really makes him special is his dream warfare, his possession powers and his ability to open portals. First of all, his psychological powers. Vecna will be able to force people to re-experience traumatic events in the form of a trance or nightmare, such as forcing Max to experience the events at Hawkins mall. It is clear where the Pennywise influence comes in here as he used to feed off of people's imagination and fear. However, I think they are especially close to Freddy Krueger because I think if they die in the trance they will also die in real life as evidenced by the monopoly cards. This is like their DnD role of using secrets and fears to manipulate, but also serves as an interesting plot device to explore our traumatized characters.
Next up, possession. There's a lot less proof for this theory but I think it would make sense. I believe Vecna himself was possessed in a sort but not by an actual creature but more by the Upside Down warping him. Victor Creel snapped and killed his family members after seeing an odd clock. In DnD, if you take one of Vecna's possessions, it corrupts you so I think that somehow seeing this clock means Vecna can infiltrate your mind and control you. This could manifest as literal possession or internal psychological warfare which could explain why Creel had to go to a mental asylum after killing his family. We already know they can control the demobats and their DnD counterpart uses secrets to control people. I think this would make sense, especially considering that the Duffer brothers said that the Upside Down was psychologically leaking out and they also mentioned how seeing the clock is a really bad sign. If this is true, then Max is in even more danger than we thought. Could she be possessed when she's floating?
Finally, portal opening. In the promotional material, we have seen the portals repeatedly showing up. At the end of every path in the individual posters, there was a portal. In the trailer, there was a frame of several portals. And biggest of all, in the poster with all four groups walking down a path, it is leading to a portal in the shape of Vecna's eye. I believe that this season Vecna will be opening portals near the characters we know and love. Not only is this foreshadowed with every location having a portal in it, but in the monopoly rules booklet it says that you need to stop Vecna from opening portals. It says 'Vecna is opening Gates to the Upside Down in Hawkins and beyond!' meaning I believe the Upside Down will come to the characters and not the other way around.
Now we've established some of Vecna's powers, what are his motivations? I think Vecna's motivation is quite simple; power. But apart from wanting power, as mentioned earlier, he wants secrets in order to blackmail and manipulate people into doing his bidding. I believe that by the start of the season he will have taken over the Upside Down but was not content with only ruling over one domain especially since there are no humans to psychologically manipulate meaning now he is going to start targeting our world, essentially using Creel as a kind of trial.
But before, I finish this post, I want to debunk a few theories. Firstly, is Victor Creel Vecna? I think all signs point to him being manipulated or possessed instead of the big bad himself. What I believe happened to him was that after finding the clock, he got corrupted by Vecna and then killed his family under this negative possession. However it is of note that Vecna went into the Upside Down in the 1960s which is when Creel snapped so whilst I don't believe in this theory, it is possible. As well as this, I highly doubt Brenner is Vecna as well as if he is in the Upside Down then he has only been there for 3 years and his crew tried to kill the demogorgon so if he was from the Upside Down then that would be an odd move.
TLDR: Vecna is a highly intelligent villain who will use a mixture of traumatic dreams, possession and portals to take over our realm and take down the cast.