Now that Volume 2 of 'Stranger Things 5' is out, and we know what the Upside Down is, we ask 13 questions going into the series finale on Dec. 31.

Tensions are high between David Harbour and Millie Bobby Brown in 'Stranger Things' season 5, volume 2, and creators Matt and Ross Duffer tell PEOPLE how Hopper's fear of losing Eleven drives him in t

Eleven accidentally created the Upside Down when she opened the gate in Stranger Things season 1. This happened during her forced experiment at Hawkins Lab. Duffer made it clear that this was not a choice she made freely.

Stranger Things 5 volume 2 reveals Eight's plan to bring an end to Dr. Brenner's experiment, and it involves Eleven sacrificing herself. She won't do it... right?

After four-and-a-half seasons of questions prompted by “Stranger Things,” in Volume 2 of the show’s fifth and final season, creators Matt and Ross Duffer offered answers aplenty, while also setting up the potentially tragic stakes of the series finale.

The biggest plot twist of Stranger Things Season 5 is that Will has powers. He not only has powers, but when he is close to the hive mind, he can get inside Vecna's mind and control his actions.

Stranger Things Season 5 teased a major final battle ahead in Volume 2, hinting at who might not make it out alive. [Warning: The below contains MAJOR spoilers for Stranger Things, Season 5 Volume 2.]

Maybe! Stranger Things Season 5 Episode 7 “The Bridge” ends with Kali and Eleven quietly agreeing to their plan to sacrifice their own lives in the final battle for the Upside Down. They exchange this vow with quiet, meaningful nods as the group officially enters the Upside Down.

Stranger Things Season 5 Volume 2 dropped on Christmas Day. It included three Episodes, setting the stage for the grand finale.