Quantum Tango
Dying is not on my to do list...
You're staring down the barrel of a revolver. Your assailant pulls the trigger. The result is one of two distinct outcomes: First, The gun fires. living is no longer a thing that you do. The other outcome is, for an infinite number of potential reasons, the gun doesn't fire. The cylinder rotates and your attacker tries again, which has the potential for the same two outcomes. Rinse and repeat. This thought experiment, while presented poorly, is a way of understanding the concept of quantum immortality.
If the many-worlds interpretation of quantum mechanics is true, and there are an infinite number of alternate universes, then there is an extremely low chance that the gun will never fire. The Discordians saw these low chances. They liked the odds, but as always, Discordians rig the game from the start.
They developed a spell that internalizes The Static and taps into this quantum state. They get to reach out and become one with their multiversal twins, create a cascading paradox as they swap fates with one, who swaps with another, and then another. It never ends, branching out for eternity across infinite worlds. They delight in this gift. They imagine themselves as Schrödinger's cat, and hilarity ensues.
Casting
The spell is cast by internalizing the static, reaching out with all the other multiversal counterparts who chose the same spell. The next step is to influence the outcome of the situation. Regardless of what the attacker does, they will be unable to cause harm to the discordian, the universe seemingly going out of its way to ensure it.
The twins experience the same result, which causes a paradox. Something that has such low probability of occurring suddenly becomes the most common outcome. Each twin experiences that same outcome, swapping their inevitable death with a neighboring twin, which in turn gets swapped with their neighboring twin.
This process goes on for infinity, as there are infinite realities one could swap with. This can cause adverse effects if it catastrophically fails. It can increase the chance of injury from another source as the universe seeks to correct the paradox. The gun may not go off, but a sudden strike of lightning or a falling tree might do the trick.
Limits
First and foremost, this defensive spell is not as powerful and game changing as it may seem. It can only be used to defend against a single assailant, a single source of danger. That source of danger is not the person behind the gun, but the gun itself. If the attacker changes their approach by switching their form of attack, the spell is no longer in effect.
Breaking the chain
If a catastrophic failure occurs, you break the chain, ending the infinite cascade across the multiverse. If this occurs, you still succeed, but you will be connected to the neighbors that don't.
You will experience their death, and potentially many more. There is a chance that you may experience an infinite number of deaths, all in the sound of a single moment.
The experience is traumatic, and while the spell succeeded, the discordian may experience guilt, nightmares, and the onset of mental instability.
So, if you choose 'old age' does that suddenly make you more likely to die from anything else so you never get to that point? I choose laceration. it's a rather painful way to go when compared to gunfire, and now I can hunt monsters! If I choose fire, do I have to choose between gas/wood/grease fire? if so, probably gas, because that's the most likely fire someone is purposely gonna try to throw at me, and it'll probably backfire spectacularly. Are these different universes you're using the fate of the same as the Oxenfree worlds, or is it different?
Choosing old age will cause a paradox. So yes, in order to prevent from dying of old age, the universe will do so through other means XD Laceration is a good one for sure. choosing fire in general will work, since fire, regardless of source, is fire. It's the fuel that changes and that chemical difference is what causes the various differences in how some fires behave compared to others.... I think. I'm pretty sure lol. I could be wrong though so how bout this. fire will work just fine. It's specific enough as it is a single source of damage. The gas/electricity/grease are not the things that are damaging you. Also yes. a spectacular backfire indeed. Much boom These are alternate realities, whitch Oxenfree explores, yes, but oxenfree also accessea other planes/dimensions and assorted weirdness. This is specifically other versions of our reality.
Can I choose a particular individual? It'd be like Wile E. Coyote trying to get bugs bunny.
You can, yes, but that would be like... roling a crit when casting the spell since that's what's required in the rpg rules. I imagine it will be quite hilarious.