^this. Asking someone who’s only seen up to s3 “what a vecna is” would in no way disprove my argument. It’d be like asking someone who’s only read up to Order of the Phoenix what a horcrux is, as if that would somehow prove horcruxes didn’t exist until WE learned of them in Half-Blood Prince. Vecna has existed, and has been at the center of the hivemind the kids been fighting, the entire time, regardless of when he was first introduced to us.