Dragon Powder Gun

Guns in this world are actively being rediscovered as some gunpowder weapons are being uncovered from before the Cladeon. With the absence of understanding of gunpowder a few artificers found another solution years ago before a traditional gun was found. They discovered that dragon scales possessed enough raw magical energy to make wicked blasts and that barrels could be slightly embedded with specific scale colors to make a weapon fire a small iron pellet.
Not many have been able to make these weapons as it requires a unique understanding of arcane and mechanical studies. Guns have exchangeable barrels and use shard powder as a propulsion mechanic. Most slingers will carry multiple barrels, the most common are fire (red), lightning (yellow), acid (green), necrotic (black), force (white) and psychic (purple). Each of these barrels will augment the damage type of the iron shot fired from it. As for the propulsion from the barrel dragon shard powder crafted from dragon scales is used. This use for scales has led to an uptick in hunting of dragon in kin since these same mechanics are what power any cannons on ships and large explosions.
When loading the barrels you’ll want to make sure you keep count as to how much powder goes into it. If you overload barre and expel all of the powder you’ve loaded at once you’ll imitate an effect similar to the breath weapons of the corresponding dragons.
Arcanist have spent years trying to figure out how this works as to them the creation of breath effects from the scales alone is terrifying and something that shouldn’t be happening. Given that these are a newer creation it is unlikely the study of the past will help them uncover much to answer this. Further study and research is needed to fully comprehend how and why these weapons work so effectively.