The Sea Tub Clarabella is a ship docked in the port of Anvil and it is here the Hero can find Dahlia Rackham.
Dahlia will sell upgrades for The Thieves Den after Dunbarrow Cove has been cleared of enemies. After everything has been bought she has nothing more to offer.
The two lower decks of the ship are host to several hostile pirates who are smuggling live sheep. If the Hero kills the pirates they do not respawn.