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Here, the situation is different; I'm developing my own setting where light gnomes use gunpowder weapons, and dark gnomes use magical firearms.
Moreover, this isn't a split faction, but rather different branches of development.
The Chaos Gnomes originated from a lost expedition. When they got lost, the gnomes didn't yet have runic magic or gunpowder, but they did have air rifles.
The light gnomes are also not the main state, but rather liberal factions that lost the war for the Throne. They seized overseas trading ports, and a distinctive feature of this faction is realistic Renaissance-era armor.
There are also hypothetical gnomes that I won't be creating – traditionalist gnomes in more classic armor. They are the ones who supply the cultists with armor.