This page explains how to complete the level 90 post-Endwalker quest "Friends for the Road".
Requirements
This quest is available if you have completed the quest Bountiful Ruins.
Starting the Quest
Talk to Estinien in Thavnair to begin the quest.
Speak with Ojika Tsunjika
Teleport to Old Sharlayan and use the Aetheryte to go to the Baldesion Annex. Go into the building and talk to Ojika Tsunjika. There will be a cutscene.
Speak with Y'shtola
Go outside and use the Aethernet Shard to go to the Studium, then go southwest and enter the building, and go southwest to the quest icon. Check on Y'shtola to proceed. There will be a cutscene.
Speak with Urianger
You can either go north to the Aethernet Shard and use it to go to The Hall of Artifice (Labyrinthos), then go southwest to the entrance of the Thaumazein building and go east to the quest icon, or you can teleport to Aporia in Labyrinthos and go east and down into the Thaumazein building and go east to the quest icon. Talk to Urianger to proceed. There will be a cutscene.
Speak with Estinien in Akyaali
Teleport to Yedlihmad in Thavnair and go west to where the orange arrow is pointing in the minimap. Talk to Estinien to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Y'shtola to accept the next quest: Alzadaal's Legacy. There will be a cutscene.