The black market was a place of mysterious trades and transactions, never lacking in providing even some forbidden goods or items for sale at inflated prices.
The money used often came from irregular channels as well, such as usury loans, laundered funds, thus making the entire market 'black'.
The black market was an illegal place where you could trade anything, or anyone. There were no explicit rules here, aside from all things that happened there would remain there and anyone that you saw mustn't be discussed with the outsiders.
If these rules were breached then the consequences would be dire, since it was easy to track you down through the magical tattoo on your arm.
