Have some ancient war deer

We must go back to the Bronze Age

You can probably pick some random spot in the Gobi or Kalahari desert and live as a hermit with some Bushmen or whatever and forget what year it is until other people show up and save you from starvation, dehydration, or hypothermia or they introduce the next pandemic virus to you.

They would possibly more violent than other films ever before.

I think the cloak is misenterpretation, no way they would think it could work as armor

Better to think of it as a soft shield.