How do you remove dark swarms? I think i remember that you have to remove for p12 but im too lazy to test it.
remove for all players, just to be safe.
they count as units, u dont see the selection when u try to delete it, but select it then delete it, it does delete. (as unit) -ya dark swarms are put into the unit category.
If you have a location set on dark swarn, remove it for it for all players. as zertual said.