Weakness Detection – The ability to sense the weak point of people and/or objects. Weakness Detection is also known as Flaw Detection, Killer Point Vision, Weak Point Sense, Weak Spot Sense and Weak Spot Vision.
Literary Critique of Weakness Detection
Karate Kid (DC) can sense the weakest point of a person or object and 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 have 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).
Karnak is able to paralyze Mr. Hyde, a Thor sparring partner, with a flurry of blows in Secret Warriors V3 #5.
Karnak #3 is a nice piece of cover art that builds on a standard martial arts diagram of weak points.
A more mundane Krav Maga version of a weak points diagram.
Make sure to read Fox Martial Arts Taxonomy!