Blackwater Family

The Blackwater Family (ブラックウォーター家 Burakkuwōtā-ka) was a wealthy family and member of the World Council. It has a genetic disease known as the Blackwater Curse, which has led to the family's ruin. Since, the family has split into several houses, each operating in different fields from politics to piracy and underground trade.

Blackwater Curse
The Blackwater Curse (ブラックウォーターの呪 Burakkuwōtā no Noroi) is a lethal disease that has occurred well after the family's foundation, and has since been passed down for centuries.