I have the season pass and I heard I will have to pay an extra $20 for flood dlc. what is this!!! >:(
No.
Maybe.
ATN is separate from the season pass.
Feel free to use the megathread to discuss this
https://www.halowaypoint.com/en-us/forums/38bd6e2ebbb14e5b9b359bb029588800/topics/atn-not-in-season-pass/6e782f8e-1343-4f43-87ac-013851eb2e7b/posts