This quest is not available in game.
Speak to Nodd at Sapphire's End in the Jade Forest.
The King's flagship went aground not far from here.
Apparently, the ship signaled Anduin's safe arrival shortly after landing, but when they sent men to retrieve the Prince, he was gone.
I want to investigate the wreckage for clues.
Nodd and Sully are already at the crash site. Go east along the beach and see if they need help.