MrLug
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You could use Greek fire or similar for ground combat or talk like sancas with the substance and set it on fire with an incendiary arrow.Also if you use catapults, they can launch metal vessels or bowls with the liquid and launch it.This as test weapons, and even a rumor arises that the Prussians have wooden dragons, or they rain fire and brimstone.I would also like to see Lothar leave a city burning for days and the other free cities react to this.