WARNING! This article contains SPOILERS for Stranger Things season 4, vol. 2!
Despite being able to escape his hold, Eleven couldn't kill Vecna in Stranger Things’ season 4 finale. Eleven spent the majority of Stranger Things season 4 at the Nina Project, where she not only brought back her powers but became even stronger than before. Dr. Brenner and Owens would eventually disclose that her powers were needed as the “cure” to stop Vecna/One/Henry Creel’s plan to take over the world, but Vecna still emerged with the upper hand in Stranger Things’ season 4 ending.
The Stranger Things season 4, volume 1 finale proved that eight-year-old Eleven had been more powerful than One when she banished him to the Upside Down in 1979. As One transformed into Vecna in the Upside Down, he came to understand his weakness as well, with the villain then seeking a way to siphon Eleven’s incredible ability to open gates between worlds. Vecna successfully stole Eleven’s powers when controlling the Mind Flayer in Stranger Things' season 3 ending, which finally allowed him to emerge stronger than Eleven and enact his plan to take over Hawkins with the Upside Down. To do so, Vecna would open four gates by killing Hawkins teenagers, including Eleven's friend Max.
Related: How Will Stranger Things End? The Biggest Season 5 Theories
The gang’s plan to use Max as bait and kill Vecna in Stranger Things' season 4 finale nearly worked, with Eleven “piggybacking” on Max’s memories for an epic “mind fight” with Vecna while Nancy, Steve, and Robin severely damaged his physical body in the Upside Down. However, Vecna was able to survive both in the Upside Down, and his red smoke mindscape, whereafter Max’s brief death opened the fourth gate. As Eleven
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