Schemes of the Lich King
The Black Stone was a merchant vessel from Port Shaw along the Razor Coast. When found floating adrift by Ellyna Dirkane, Suriveth Varune and Kouro Marmai, they discovered it was abandoned, the result of an arcane mishap by an unknown wizard. A portal to some other place was in the decks below. They sunk the ship unknowing that it would form a most vile whirlpool along a major trade route.