Note: You must complete step 8 of Of Sea, Sails and Slumber while standing very close to the chest, otherwise this quest will not update properly. If you get a broken quest at this point, read the book while standing next to Biddy Bobick.
When you are on the boat, position at least one group member at the front and on at the rear of the boat to wind the disruptors every minute to keep the mechanomagical devices free of frost. Failure to do so will allow the frost frights and valkyries to pile onto the boat once the battle begins, making a huge mess that gets harder and harder to clean up as time goes by.
Hail Rath'Adran. The battle will begin after you are done talking and several waves skeletons and valkyries (level 38-40) will attack.
After a few minutes, Rath'Adran walks out onto the main deck near the main mast, taunts the party, and turns into a drakota (~43^^^).
Kill Rath'Adran and head back to the helm of the boat.