i mainly do dark archon destruction, but soverign, bounds are like... there may be 10 different explosions like this
here are locations
1 2 3 4 5
6 7 8 9 10
create one darkarchon at 1 and 6, kill all units at 1 and 6, and then do that to 2 and seven,and keep going, so it makes like a wave pattern, thats a simple one, there are more complicated ones as well