Mr_SRG
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On the subject of the use of firearms, you could start by discovering it by an alchemist in Essos, and starting the fight there, having a merchant give it to a lord who is an enemy of the MC. You could use it like conventional explosives, incendiary arrows, rudimentary cannons that can only be used a few times, put it later in the story, that manufacturing is very protected and that few are capable of doing it It's just an idea and you don't have to use it, but it could be interesting, you could even put it in as something alchemical and have the mc make his scientific version