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The Setting:

In my sci-fi/fantasy dystopian world, some humans are born with Sparks, which grant them the power to wield extraordinary power coinciding with the power of their own Spark. In this world, 2 extradimensional beings represent creation and destruction. Pikkon, The Creator and Nova the Destroyer. Together, they give out sparks to the souls of people. In this setting, the world has been plagued by 4 titans of different elements, and after being outcasts of history, the people with Sparks finally reveal their power and existence and form connections with the world government to stop the Titans from ending the world.

The Question:

The MC has the Spark of Nova, The Destroyer. A xenomorphic-like being that embodies destruction (the spark is an infinitesimal portion of the power of the god-like being).

This Creature has the power to breathe a liquid-like substance that moves sporadically and violently explodes upon contact with a solid surface.

Is there any substance that portrays similar behaviour to this? Or should I keep it purely fictional?

Yes, this is inspired by the mod, Primal Fear for Ark Survival Evolved, by Pikkon

(i am also very new to this, so any constructive feedback on writing questions is helpfull!)

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    $\begingroup$ Any solid or liquid passes through gasses but reacts violently when confronted with solid matter. that's how car crashes, punches, bullets and so on work. $\endgroup$ Commented Sep 18, 2025 at 9:20
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    $\begingroup$ Nitroglycerine. $\endgroup$ Commented Sep 19, 2025 at 2:55
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    $\begingroup$ Actually my suspension of disbelieve would actively be hurt by the <b>extradimansional magical creature</b> just creating "ordinary explosives", <b>unless</b> the plot twist is that these creatures aren't so extradimensional and magical after all. It's a bit like finding out that the fireball throwing wizard in the medieval setting just has a pistol. After finding that out I wouldn't be very confident in the wizards magical abilities anymore. It can be a cool plot twist, but without the plot twist it would take something magical away from my POV. $\endgroup$ Commented Sep 19, 2025 at 5:56
  • $\begingroup$ Ordinance with a contact fuse? en.wikipedia.org/wiki/Contact_fuze I know, not really a liquid but definitely explodes on contact with solids $\endgroup$ Commented Sep 19, 2025 at 7:49
  • $\begingroup$ Welcome to the Worldbuilding Stack Exchange. While I have nothing to contribute to the context of your questions, I would like to recommend that you put a bit more effort into writing those questions to make sure that they are more grammatically correct. Enjoy asking, or even answering questions! $\endgroup$ Commented Sep 19, 2025 at 11:58

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While it might be rather hard to breathe it, there are some nitrogen compounds that kinda sorta fit the bill...

One is a compound called Azidoazide-Azide (which just sounds sci-fi). And as Hank from SciShow explains, Azoazide-azide explodes when "moving it, touching it, dissolving it, leaving it undisturbed on a glass plate..." This is a compound that REEEEALLY doesn't want to exist.

And if that's not flashy enough, you also have the less sci-fi sounding but more visually dramatic Nitrogen Tri-Iodide which Wikipedia describes as: "An extremely sensitive contact explosive that can explode when lightly touched, releasing a purple cloud of iodine vapor" which just sounds cool as heck, and really, doesn't death by explosive purple cloud just sound perfect for the breath of an extra-dimensional god of destruction?

Suffice to say, yes, there are (technically) compounds that react explosively (effectively) on contact with all forms of solid matter (although why Nova doesn't also explode is left as an exercise for the author).

And yes, these compounds would likely explode in the air of their own volition, but you can hand-wave that by claiming that the air was "too dirty" and there were tiny microscopic dust particles which disturbed the death breath... (good excuse to require people wear a space suit and use an evacuated vacuum chamber when handling the stuff).

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    $\begingroup$ That means Azidoazide-Azide does blow up when passing through gas, making them non-applicable to the question. As does the Nitrogen Tri-lodide - the pressure of air can blow it up. $\endgroup$ Commented Sep 19, 2025 at 1:59
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The answer Dutch gave is pretty much the one you are looking for. There are certainly liquids that will explode violently when coming in contact with other (solid) chemical elements, but never with all other (solid) chemical elements. That would require bending or breaking the laws of physics.

Generally. The second you introduce a magic system in your world you will have to break or bend the laws of physics. Because otherwise PHYSICS ALWAYS WINS and there is no magic left. Whenever you introduce a magic system it will break the laws of physics. It is okay that it does that. It should just follow a set of rules that you define. Work that out and you are good to go.

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Antimatter

Technically, this will annihilate and explode violently on contact with any normal matter, but the atoms in a gas are separated enough that the number of annihilative collisions will be minimal. But if a chunk of antimatter comes into contact with denser matter such as solids (or liquids), the resulting explosion will be pretty severe. That said, if your creature is able to safely imbibe antimatter, it must be made of antimatter itself, and thus would itself explode violently on contact with matter. It would probably have to live in space to avoid too many matter collisions. Perhaps to have this be a continual threat, it'd have to be able to spawn antimatter offspring at a good enough rate to counteract the losses due to annihilations. Or it'd just have to be some sort of swarm to begin with.

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    $\begingroup$ "the atoms in a gas are separated enough that the number of annihilative collisions will be minimal" they would very much not be. $\endgroup$ Commented Sep 19, 2025 at 15:01
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    $\begingroup$ One cubic meter of earth atmosphere at STP weights almost 1.3 kg. While any non-microscopic solid object inside that volume is obviously only interacting along its surface, most of that gas will intersect the object pretty quickly due to the high mobility of gas molecules. If those molecules are energetically annihilating on impact, they'll be creating turbulence and low pressure zones which will pull in yet more gas molecules. In short: no, antimatter in even a thin atmo will almost instantaneously cease to exist in a loud, diffuse, non-directional manner. $\endgroup$ Commented Sep 19, 2025 at 17:11
  • $\begingroup$ @JayMcEh in fact, the mean free path (that's the word for what you're describing, the average travel length between collisions) for antinitrogen is 68 nm. $\endgroup$ Commented Sep 19, 2025 at 19:28

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