This page explains how to complete the level 90 post-Endwalker quest "Paths Barred".
This quest is available if you have completed the quest A Dragon's Resolve.
Starting the Quest
Talk to Zero in Garlemald to begin the quest.
Wait at the Designated Location
Teleport to Radz-at-Han and use the Aetheryte or an Aethernet Shard to go to Meghaduta. Go to the quest icon on the map and check on the sparkling Destination to proceed. There will be a cutscene.
Speak with Zero
Talk to Zero to proceed.
Go north to where the orange arrow is pointing in the minimap. You may wish to teleport to The Great Work first. In the northern part of the orange circle on the map, talk to Imhudi. Then go to the northwest part of the orange circle on the map and talk to Khuteeyu.
Speak with Nahbdeen
Go to the quest icon on the map and talk to Nahbdeen to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Nahbdeen to accept the next quest: Desires Untold.