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... The bathhouse needed to burn hot water, a lot of it.
In this era, humans burned wood to heat water: commoners used firewood, nobles used charcoal, and there were no records of coal use—coal was likely not a product of dragons, as it is neither a metal nor a gemstone. It seemed that no humans knew about this mineral called coal, at least not in the Duchy of Sapphire.
There were also no records of other fossil fuels like oil or natural gas.
According to Liszt’s speculation, ...
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