Stranger Things theory believes Eleven’s ‘lost sister’ from season 2 will help her defeat Vecna

gamesradar.com:

If Stranger Things season 4 left you wondering whatever happened to that other 'number' with psychic abilities that we briefly met in season 2...you're not alone.

Warning: Spoilers for Stranger Things season 4, volume 2 ahead!

Since a single Eleven, the four-time champion of saving the world with powers so strong she accidently opened the Upside Down, was ultimately unable to defeat Vecna – what about two Elevens?

Season 2 introduced us to Kali Prasad aka 008 aka 'The Lost Sister.' Much like Eleven, Kali also managed to escape from Hawkins National Laboratory. (Though we're not quite sure how she survived the massacre at Hawkins lab that left nearly everyone dead.) Eleven finds Kali via remote viewing, and ends up at the Chicago warehouse where Kali and her gang of punks lay low and plot their next move for revenge. The two show each other their forearm tattoos and, in a sweet moment, declare each other as 'sisters.' We quickly learn that while she also has psychic abilities, hers differ from Eleven's. 

Kali can create a hologram of herself or someone else and can manipulate the mind to experience hyperrealistic events that no one else can see. This is displayed in a few different ways: when a cop is chasing her and the gang, she distracts him by making him witness a bridge collapse; after gang member Axel threatens Eleven; Kali causes dozens of little spiders to crawl out from under his sleeve; before her and Eleven part ways, she creates a beautiful butterfly as a gift to her 'sister.'

Is there anyone else in the world of Stranger Things who has the power to construct hyperrealistic events that no one else can see and create the hologram of a person who isn't actually there? Oh yeah, Vecna.

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