This page explains how to complete the level 80 post-Shadowbringers quest "A Whale's Tale".
Requirements
This quest is available if you have completed the quest Deep Designs.
Starting the Quest
Talk to Urianger in the Tempest to begin the quest.
Speak to Urianger in Sullen
Teleport to the Ostall Imperative in Lakeland and go southeast to where the orange arrow is pointing in the minimap. Talk to Urianger to proceed. There will be a cutscene.
Speak with Urianger
Talk to Urianger to proceed. There will be a cutscene.
Remove Tenacious Barnacles
Go northwest to the orange circle on the map and go underwater.
Go to the west side of the orange circle in the map and check on each of the three sparkling Tenacious Barnacles.
Speak with Urianger
Go above the water. If you haven't unlocked flying yet, go to the east side of the Isle of Ken to find solid ground to walk up on. Go to the quest icon and talk to Urianger. There will be a cutscene.
Speak with Thancred
Talk to Thancred to proceed. There will be a cutscene.
Speak with Thancred Again
Go northeast to where the orange arrow is pointing in the minimap. Talk to Thancred to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Urianger to accept the next quest: Beneath the Surface.