Is there a simple way to make units become stunned after being hit with an artillery/attack-ground attack? Such as an ability or something? I suppose I could spawn a dummy, but I'd rather do it a simpler way..
A unit takes damage
damaging unit = artillery
create one dummy unit at damaged unit
cast thunder clap (edited, of course, to not deal damage and just stun).
kill dummy unit
Cluster rockets without the rocket animations may be better. You may even be able to change the cluster rockets to normal artillery and not even need a dummy.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.