Idea ;p, but you must have the following trigger:
Change Units in Area of Protounit.
Basically you turn the new heroes as rocs first, then use search triggers to garrison some crappy protounit in there, then turn the rocs into heroes, and bam now you have a device inside their bodies so you can finish them off with your button of doom ;p.
GL XD.
The Gods have left us, therefore making the old world crumble and turn into ashes...
But as the gods return, from the ashes of the old world, shall rise a more beautiful and powerful new world, and life will begin once more, if they hadn't closed...dang you ES.