Human beings are funny. We make up all these aliens and heroes and give them one major flaw. One weakness. Aliens that always seem invincible except for one weakness. Superman’s only weakness was kryptonite.
I don’t know why we come up with those things when we don’t have only one weakness. Practically every part of a human being is weak. You can get hit on the head, leg, arm, torso, and it hurts. Every part of the body is a target. Many places can deliver a killing blow, or incapacitate you easily. We only wish we were near invincible beings.