This page explains how to complete the level 80 post-Shadowbringers quest "Hope's Confluence".
This quest is available if you have completed the quest The Converging Light.
Starting the Quest
Talk to the Crystal Exarch in the Crystarium to begin the quest. There will be a cutscene.
The Seat of Sacrifice
Use the Duty Finder to enter the Seat of Sacrifice. Please see the Seat of Sacrifice Guide for a walkthrough.
After you complete the duty in the Seat of Sacrifice and exit the area, there will be a cutscene.
Speak with Ryne
Talk to Ryne to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Y'shtola to accept the next quest: Nothing Unsaid. There will be a cutscene.