Weakness Detection – The ability to sense the weak point of people and/or objects.
Karate Kid (DC) can sense the weakest point of a person or object uses his Super Karate to fight Superboy twice. Karate Kid loses the first time but not before giving Superboy quite a struggle (Adventure Comics V1 #346).
Karate Kid reflects on the fact that Superboy’s only weaknesses are Kryptonite and magic so he is out of luck (Karate Kid #12). Karate Kid uses the ole “use Superboy’s indestructible cape to trap him” trick a second time as well but in the end loses anyway.
Karate Kid hits the weakest spot of Omega, a creature more powerful than Superboy but to no avail in Legion of Super-Heroes V1 #251.
Karnak’s strength level is peak human but he is a master of an inhuman martial art that resembles karate. Karnak (Marvel) appears to applied a choku-tsuki (直突き) or corkscrew punch to the solar plexus of the Hulk but the Hulk is just too tough (Inhumans V1 #12).
Karnak has more luck attacking Thor at the gaishoho point which is on the Pericardium meridian between the Radius and the ulna bones with a haito Uchi i.e. ridge hand (Amazing Adventures V2 #8).