Mercury actually has a vast economy due to farming caves. Low managing costs, endless surplus of unused ammo, gear that is seemingly left unused or broken in the caves but easily repairable.
There is actually a gunsmith from mercury in the last city that sells these to new guardians at 70% profit margins.
All in all a win win.
English
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Where is this guy at? I never knew about him.
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I believe he has almost cornered the market and is in the central section of the tower.
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Are you talking about the gunsmith at the top right center area?
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( ͡° ͜ ʖ ͡°)