The Return of the upside-down

Instead of being trapped in the upside down for a week, Will was trapped in there for one month. He learned to survive, mentally changed, but not just mentally. He changed physically as well, gaining unique characteristics. Will and the others are now 13 and eleven months have passed since Will's return and Eleven's departure. There is still no news on El and life has returned to normal, or so it would seem. But not everything is as it seems, and a new threat looms on the horizon.