The plan to defeat Vecna involves using Max (Sadie Sink) as bait, since, as she finally reveals to her friends, she's still under Vecna's curse. She has Lucas (Caleb McLaughlin) by her side to play a well-timed "Running Up That Hill" if she needs it, and Eleven also ends up using her powers to help Max.
But it's not enough. After a long chase and a lot of emotional torment, Vecna gets Max. In the real world, Lucas sees her float the air and her arms and legs break. Eleven, Nancy (Natalia Dyer), Steve (Joe Keery), and Robin (Maya Hawke) finally attack Vecna before he finishes killing Max, though.
When viewers see Max again, she's in Lucas's arms, dying. She tells him she can't feel or see anything and she's so scared. Lucas begs his sister Erica (Priah Ferguson) to call an ambulance, but Max quickly dies.
But that's not the end of her story. Eleven uses her powers to urge Max to live. We find out later in the episode it worked. Lucas tells Eleven, Mike, and Will that the doctors said a miracle brought her back to life, but they don't knew if she'll ever wake up. Lying in a coma, she has casts on both her arms and legs, plus a neck brace.
Max isn't the first "Stranger Things" character to come back from the dead, but she is the first one whose resurrection Eleven directly had a hand in. We'll have to wait for season five to find out if this means Eleven's powers have expanded in even more directions.