Wan Guo, the Jade Sage
Wan Guo operates a gambling house in Chendl known as the Golden Wheel. Wan Guo has been known to allow people to make bets on credit, and then take ruthless advantage of them when they lose. Merchants, ambassadors, and even entire noble houses have been destroyed in his gambling den.
Ruined gamblers have tried to assassinate Wan Guo on multiple occasions, only to discover how terrible their idea is before they died. He is apparently very hard to kill. His enemies often turn up poisoned.