....Shiiiiineeeeyyy...
Oh crap, almost lost myself there. And Gust... is even worse. No wonder, considering his lineage.
The source of my brainless state lies before me: a stupid-big moneybag, filled to the brim with cash.
"To summarize, 100,000 Sol for the safe return of the protégé of the Library Tower, now named Gust, plus the bonus of a copy of the Library Tower's newest version of the Skill Encyclopedia and Class Register, one volume of each, for taking so good care of said protégé, granting him a name, and even helping him in evolving." - Carion
The moneybag contained mostly golden coins named Half-Golds. According to the Union Master, the currency here's called Sol and divided between bronze, silver, and gold, plus some more advanced metal-variants higher up that normal people will never have a chance to lay their eyes on.
There goes a hundred Bronze Sols for a single Silver Sol, then the same amount of Silver for one Gold.