I got a stupidly cool idea to add a sound when some npc dies falling to the ground, then there is a rare chance but not too rare that there will be the sound of The Wilhelm Scream or Goofy Yell.
Might be a massive pain to implement for every mob. Maybe just some for mobs that had the Wilhelm scream in the movies? I believe there were a couple from the likes of Gondorian soldiers or Haradhrim but I don't remember that well. Should really watch them again.