At the end of the turn in which a collapse occurs, remove the tile indicated in the relevant Memory.
At the end of each subsequent turn, remove all tiles in contact with those previously removed. Also remove those that are no longer in contact with any tile. The miniatures present on each removed tile are Eliminated (Enemies go back to their Reserve).
Note: In order to locate the tiles that will disappear, place a yellow reminder token on each of them at the beginning of each game turn in which a collapse occurs.
Example: Tile 1 will disappear at the end of the first turn of the collapse, number 2 tiles will disappear at the end of the second turn, etc.