Shipbreaker (quest)

Shipbreaker is a quest in the Fallout 4 add-on Far Harbor.

Detailed walkthrough
While exploring Far Harbor, you may randomly pick up the Shipbreaker's radio frequency, immediately starting the quest. Follow the signal to a patch of land near a ruined house, where you will find Shipbreaker, a unique fog crawler. Once the fight is over, you are prompted to speak to Old Longfellow. He will talk about how he has been searching for Shipbreaker for years. Tell him that Shipbreaker is dead, and the quest will complete with you earning Skipper's Last Stand, a unique harpoon gun that Old Longfellow was saving to deal the final blow on Shipbreaker with.

Bugs
If a player doesn't track it down during its original appearance it may vanish with the message "the shipbreaker has moved on for now". It will then fail to reappear and it radio signal will be blacked out even though it will still lead you to the quest location. This can be fixed using the console commands after traveling to where shipbreaker should be type in showquestvars DLC03WorkshopRadiantOwned05 to get the shipbreakers ID. Then "prid whatever the id is". Once this is done it should be showing at the top of the console. Then type disable press enter then enable press enter again. Once the console is closed shipbreaker should spawn and you can kill it and finish the quest.