i modified a starfall so that rain and ice "stars" fall down. but there is just one of them only the ice or only the fire it changes always..... how to do that there will fall both down the sky??
Have a dummy unit at the position of the (Casting Unit) cast one of the starfalls in parallel with the caster. Have the caster let's say cast with ice and the dummy with fire. You can even create the dummy a little later to make a nice fire-ice combo.