Stranger Things season five when Dustin and Steve are arguing and Dustin explains how he found Dr. Brenners journal how the key to destroying the wall is in the lab, but it is not a shield generator, it isn’t dark magic vecna didn’t make it science did vecna didn’t make the wall so he isn’t on the other side which means Holly and the missing kids aren’t there either nobody is and then Steve asked what’s on the other side of the wall and he replies death.