The bones of the Elderlings
A ship made of wizardwood by the Rain Wild Traders, and sold to families of the Bingtown Traders.
These ships are the only vessel that is able to withstand the caustic waters of the Rain River and they hold a monopoly on transporting all of the “magical” items that come from deep in the Rain Wilds.
The price for a liveship is substantial, with families often committing further generations to fulfill the repayments. If a family is unable to pay, then a member of the liveship family might be surrendered to the Rain Wild Traders. This begets the phrase, “In blood or gold, the debt is owed.”
These ships are rumored to be alive and if you go down to the docks you might be able to hear them talking to each other.