I had this as a dream. 8 person fireteams and at first u are all together and bound together (bound as in attachment to your back that dont let u get a few feet from a member of ur team) because their is a wicked light abound, and u are together because of safety And I gotta find your way through this corridor place and then some how u get to this rocky under ground mining like area thats where the wicked/infectous light beings. Periodically by period I mean like every minute or so all of ur fireteam members transform into enemy what ever they maybe and addition ones spawn so u can tell the difference and u can kill ur fire team and when a teammate jumps and moves all u c is an enemy moving around and this happens multiple times and after the first infected transform this the confinement amongst the team is gone and then there is like a train thats two guardians height tall and wide and there is a specialized spider tank on it which is really hard to kill and its moving fast, faster than a sparrows top speed. u have either get on the train and If u miss it another one will come by and as many come by as necessary and jumping on the train makes u move backward the only way to move forward is by walking or running on it or u could run a path that takes 20 mins by sparrow and this wicked light can infect u any where in any mission for any dlc in the game. If u make this a raid dont use previous raid ideas.I dont remember what happens after this dont be afraid to had more (duh) and sorry for the poor grammar I wae at school making this but email me @ boverbjbd@gmail.com for business inquiries btw im 16