Project Aether (name isnt official) (ninjago)

This is a military dystopian Sci-fi kinda fanfiction abt ninnago, all the ninjas are main characters, some might get more spotlight, in my au Kai was taken by the military due to some past deal wu made with the head of the military, so he's already a soldier, one week a portal opens ( kinda stranger things vibe here) and the ppl are forced to go into the underground city (monsters come out) (Kai was taken at 17 for the military, the portal opened when he was 25, present time he's 27) *THIS FANFIC CONTAINS VIOLENCE, SOME WORDS, MENTIONS OF TRAUMA AND SELF-HARM, BLOOD, GUNS, MAYBE SOME GRAPHIC INJURYS (but dw it will only be for a few scenes) MURDER, SOME Phobias, WILL NOT CONTAIN S SCENES*