What Ferde had plenty of was money, while the black market in the North had plenty of slaves to spare.
In the black markets of the northern kingdoms, if your price was right, the Syndicate would provide you with anything you wished.
The Golle Kingdom, one of the Leo Kingdom's neighboring states, saw the most active slave trade among the four northern kingdoms.
The Golle Kingdom had a huge geographical advantage, as it shared its borders with the other three kingdoms. With the ocean stretching to its east, the Golle Kingdom had one of Firuman's first largest ports within its borders as well, called Port Antique.
Incidentally, a slave market thrived in Port Antique.
On that day, an elderly man with thick flaxen hair and gristly sideburns arrived at the market.