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i want to make my dragon spew/breath explosion mix with the gizzard stone fragments/shrapnel rather than common fire breath like a flamethrower but more like a shotgun.

so is there any explosion chemical that can be reproduce biologically and safely contain into the biological creature internal organs? (i mean something like gunpowder explosion not hot water jet like bombardier beetle or from pure pressure/ muscle contract, al though i dont exclude liquid type of explosion) and if possible include the pros and cons/risk of such chemical to the dragon.

what kind of organs need to be developed or change to achieve it?

the dragon teeth can be retracted so the teeth wont get knock out. similar like Toothless from how to train your dragon

enter image description here

i also considering shark teeth growth like, if retracting the teeth is impossible anatomically or biologically, so at least the teeth can be knock into another sharp shrapnel with the gizzard stone without fear of become really Toothless.

or should i use the tongue like canon to spew or breath explosion instead?

or should i use mouth shape like canon or seahorse mouth instead? if i need to modified the mouth, please also provide likely food or way to eat for them (they are pure carnivore btw)

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    $\begingroup$ It has been years since I've seen a concept of dragons that made me say "hey that's awesome!" I wish we could award bounties to questions! $\endgroup$ – Renan Oct 17 at 12:21
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It should be possible for your dragon to pick up pebbles, which it stores in a small pouch near its throat. When it needs to attack, the pouch will contract and bring the pebbles to the back of its mouth. Muscles in the throat will block of the oesophagus and the nose, so that when the dragon forcefully exhales, the air from its lungs forces out the pebbles in an explosive manner. Surprisingly, most species can already do something similar, even humans. We call it...coughing.

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  • $\begingroup$ uhh...i mean not from pressure kind of force, hence "hot water jet" , but through explosvie chemical reaction. but apreciate nonetheless $\endgroup$ – Li Jun Oct 17 at 12:07
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    $\begingroup$ @LiJun: The problem with explosions is that they go both ways... $\endgroup$ – nzaman Oct 17 at 12:23
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    $\begingroup$ @LiJun: If the explosion projects a mass of 1kg at 10 m/s forward, it must also project a momentum of 10 kgm/s backwards. That means if your dragon uses a projectile attack on something in front of it, it must absorb the same amount of damage inside its mouth. Now, consider what it means to fight another dragon...if it manages a hit strong enough to knock its opponent back, it must take the same hit near vulnerable innards; the other dragon at least has armour protecting it. You get the most peaceful dragon species in the world, as the ones with a habit of striking first wipe themselves out. $\endgroup$ – nzaman Oct 17 at 12:31
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    $\begingroup$ @LiJun: The primary reason any animal has weapons is to beat off competitors, usually their own species. It's pointless to get into an arms race with predators; far more efficient to just run away. A dragon's weapons must therefore be capable of harming dragons. Now, in the case of fire, the damage is done by the heat, not the impact of the relatively tiny amount of mass. In this case, though, you are using the momentum of a projectile to cause the damage, therefore, there must be an equal and opposite impact to your dragon as momentum is conserved. It doesn't matter whether the projectiles... $\endgroup$ – nzaman Oct 17 at 17:18
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    $\begingroup$ ...are shrapnel or ball-bearings, the damage is done by the momentum of the projectile being transferred to the target. Again, by conservation of momentum, your dragon is receiving an equal amount of momentum being transferred to it, and this is the important part, inside its armoured hide. If your dragon wants explosive force to drive a projectile, it needs to buy a gun like everyone else. That way, the damage is to the inside of a metal barrel, not the inside of a squishy body. $\endgroup$ – nzaman Oct 17 at 17:22

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