The Superhero World

Alexandra Stone is the most powerful thing in the world. Unlike most superpowers that allow the super to wield potent abilities, Alexandra's power is extremely subtle and not actively used. It manipulates the magical "current" of events and is best explained in a river analogy.

All attempts to attack Alexandra enter the "river" of fate, which will "roughly fling you ashore" in the form of misfortune. It starts off where the harm the attacker gets is proportionate to the harm they try to inflict, but each time one "attacks" they enter slightly further "downriver" than the previous time. If they reach the "waterfall" at the end rather than disengage enough to "walk upstream"(not a length of time, but instead one must reset by genuinely giving up on the attempts and moving on), then the next hostile thought, no matter how minor, in the presence of Alexandra will result in almost instant death.

This ability takes priority over everything. Material properties of objects involved don't matter, it interferes with other superpowers and can outright hijack them if they have any degree of randomness, it works at any distance, and the mere act of trying to find a loophole to inflict harm makes the retaliation worse. As an example of how ridiculous it is, somebody else has the counterpart ability where the "river" carries him toward his goal if it's physically possible and this ability treats attacking Alexandra as simply something you can't do.

It still does have a weakness though, which is that it is possible to trap Alexandra with environmental hazards in order to force a fight as long as she could reasonably avoid those hazards. Once Alexandra starts a fight, she has "come ashore" and needs to make a genuine attempt to disengage before people start getting struck with misfortune again.