Oh, forgot to mention... The biggest problem with currency in the Netherworld would be counterfeiting via Shaping. So, again, my pick for the faction with the most stable currency would be the Four Monarchs, who are powerful enough to create currency that can't be Shaped by anyone except themselves. Sure, anyone with a Shaping skill could make something that looked like a Thunderbill, but the lightning bolt just won't light up when you rub it like Huan Ken's Thunderbills do. Likewise, when you breath on the solid ice coins that Pi Tui prefers, the Snowcat's eyes glow green. The fakes don't do that. Li Ting uses bills and coins made from solid fire... cold enough to handle, but drop a few drops of water on 'em and they'll sizzle. As for what Ming-I uses... scraps of tattooed flesh and bone, like bat wings torn off of bats... poke 'em with something sharp and they bleed. Let's just say they're not terribly popular outside the Darkness Pagoda. If someone had a high enough Shaping score, could they copy these things? Well, in theory, maybe, but everyone who tries fails miserably... you could toss in some handwaving here and there about the Four Monarchs have manipulated the chi flow throughout the Netherworld with powerful sorcery so that anyone who tries to create similar currency automatically fails. Another solution could be touchstones provided by the Monarchs that immediately identify counterfeits. Or maybe just trying to shape the currency is touchstone enough... if someone hands you a shaped coin or bill and you can shape it into something else, then you know it's counterfeit. The Monarch currency can't be shaped because they make it that way, and the only people in the Netherworld that can undo their shaping or their sorcery would be one of the other Four Monarchs.
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