The Steady Wizard: From Heart-Switch Rat to Dimensional Demon

As for what to do if there are taboos in the future...-

By the way, there is another small matter. The deal between Isaac and Princess Filo in the Mad Witch Coven was also known by the Terra Royal Family. They did not ask Isaac to cancel the deal, but directly cashed in the golems and gave Isaac a full 10 million gold coins in cash!

Being a slave trader, you can make money and also follow his legendary path to gain power. It is simply perfect.