Perfect.
That is exactly what I was missing.
I find it odd that there is absolutely no hint of this on the HHR page …
I suggest this as a house rule to prevent the hero swarm.
No more than one hero per 100 points.
Credit should go to Dr.Cornelius, even though he hasn’t joined this board yet.
Also, I just thought of this one today. How about this …
Heroes can only spawn after being hit by an enemy unit or successfully hitting an enemy target.