Think of it as a zombie mode, kinda like cod but in a turn based format. Will drain/fatigue can be refreshed each wave, just so 1 person doesn't get too many kills and headshot can be reduced from a 100% chance to occur to something like 70-80% just so you aren't just destroying wave after wave and thinking it's too ♥♥♥♥♥♥♥♥ easy. Leave grenades just default if you want. Just a fun idea I thought of, hope it's made one day xD. Yes you can just do horde missions, but this would make it more wave based instead of using explosives brings more and eventually the lost won't come anymore, depends on mission type really, and horde missions have objectives that are usually timed, So a lost wave com wouldn't be so bad. Just for difficulty add a lot of lost, 1 or 2 swarms more with each wave. Hope this gets at least considered xD