Put all of your Monsters into a family called "Family_Enemies".
Give the ring an instance variable called "Scale"(number) give it the value of the starting size of scale you want it to be when spawned.
and another instance variable called "Grow"(Boolean) set the value to true
Create a condition:
Ring > Is OnScreen > System >Set Scale > Ring.Scale
Create another dual condition:
Ring > On Created > Ring Add .02 to Ring.Scale
Ring > Grow(is true)
__(Sub Event) Ring.Scale =(or greater to) 5.0> Ring > Set Grow to False
______________Ring.Scale > Ring.Scale to 5.0 or (Destroy) or (Fade)
Create another condition:
Ring > On Overlap > Family_Enemies> Destroy Family_Enemies