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"Likewise, in fiction, whatever power a character has must have a downside somewhere, or he becomes a boring Superman type of character who can handle anything and get out of any difficulty, and he won't interest readers for long."
Timothy Zahn

The Kryptonite Factor is an Achilles Heel, where the weakness is a substance or state that only affects the Super Hero. It serves a few purposes.

The artistic one is to show that no one is invulnerable, not even our godlike main character. This is especially ironic if the vulnerability is completely arbitrary and commonplace.

The more powerful a character is, the more likely the Kryptonite Factor will be abused. Writers in particular tend to dislike immensely powerful characters with a single Kryptonite Factor, because not using it creates a drama-destroying sense that the character is never under a serious threat. Conversely, working a rare Kryptonite Factor into the plot repeatedly can seem even more contrived.

The most obvious example is kryptonite, the bane of Superman regardless of how powerful he is being portrayed at the time. A literal green rock, it seemed unusually abundant in supervillainous hands for being radioactive bits of planet that exploded light-years away. Many Elseworlds and spin offs to the Superman mythos include characters who are more resistant to kryptonite, but conveniently, not as strong.

In contrast, writer Joe Quesada has mentioned finding sorcerous characters such as Doctor Strange difficult to write for, because there is no established Kryptonite Factor, as magic tends to have fewer set rules and more contradictions. (What this says about Quesada is something for another page.) Likewise, the DC character Zatanna has very open-ended powers - she just has to say something backwards to have it magically happen. (At times, she may not even have to say it out loud.)

See also Kryptonite Ring and Fight Off The Kryptonite. Contrast De Power and Drama Preserving Handicap. Related to Why Did It Have To Be Snakes. If the character is vulnerable to something comparatively mundane (and even non-threatening), that makes it a Weaksauce Weakness. When this trope turns up far more often than seems probable, see Kryptonite Is Everywhere.

Not to be confused with The Krypton Factor. Contrast Logical Weakness, wherein the weakness logically comes about as a direct result of the powers.


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Kirby DotsComic Book TropesKryptonite Is Everywhere
The Kobayashi MaruSpeculative Fiction TropesKryptonite Ring