King of the silver river
The King of the Silver River is a supernatural entity assocaited with the Silver River.

When Jak Ohmsford's party was on their way to Culhaven, the Shifter with many monsters were waiting for them on the banks of the River. Then a wave of lightning covered the monsters and the travelers fell into a trance. Some of them saw the King telling them about the choices they would make in the future. The King then transported then somehow to their destination and when they regained their senses, they found themselves outside Culhaven.