Steelheart Cave

 is a cave located just north of the settlement Steelheart Moorings, in Stormhaven. It is in this cave the Slavers are holding the captured sailors.

Divert and Deliver
Slavers are using Steelheart Moorings as their base of operations and they're holding some sailors who they recently captured. The first mate has aksed the Vestige to help free the sailors from the slavers' clutches.