I just cleared most of the map then walked towards the otzi area to find the otzi boss.
You are doing the golems wrong, it has nothing to do with corpses. Just bring them all to a single place to die. Make them all die in the same place. Hit them then run to the same identical spot and kill them there. Ensure they all die in the very same place. I don't know many more ways to say it, but I hope you get the idea?