The rumoured white whale as described to the crew by Rikas Russ.
While Carousing in Kaja, Inardal encounters an old Whaler by the name of Rikas Russ in the Warm Hearth Inn.
He tells a tale of a Huge Norwhale that took his crew, and his arm. He says that the Norwhale must have the remains of his crew's treasures trapped in it's gullet - as he has seen many Norwhales with treasures trapped there.
In this particular case Russ is certain that a magical ring, worn by his ship's mage will be there. It allowed the mage to breathe and move underwater as if he were above land.