For the current Coil, I think they should do it this way

Second Coil (story version)

Turn 1) Remove Blighted Bouquet, remove adds
Turn 2) Remove petrification buff, makes renaults killable and their auto attack hit for ~1000
Turn 3) turn off towers
Turn 4) Remove everything except Heaven's Fall

It basically has to be children mode Coil so people can get the side quest completion or something. Obviously, it doesn't drop any loot.