And that they seem undeterred by pain or fear. It's like fighting someone hopped up on drugs - you can hurt them all you want, but it won't stop them. They take a slug to the arm and keep on coming. Tactics-wise, people who are still intelligent but have no regard for human life, including their own, are the scariest people ever. Because they don't have to retreat. They always win chicken. You can't fight them to a draw - as long as one is still alive, he'll still be trying to eat you. They mutilate themselves - what on earth can you do to stop something like that?

The Reavers scare the living daylights out of me. Chuckro has the fingernail imprints in his arm to prove that one.