You defeated a Lightwarden and brought darkness back to Lakeland.

Requirements

This quest is available if you have completed the quest The Lightwardens.

Starting the Quest

Talk to the Crystal Exarch in Lakeland to begin the quest. There will be a cutscene.

Speak with Alphinaud in the Crystarium

You can either teleport to the Crystarium, or you can go south past Fort Jobb, then east through the gate into the Crystarium. Go east from the Crystarium Aethernet Plaza and talk to Alphinaud.

Speak with Bragi

Use the Aetheryte or an Aethernet Shard to go to the Musica Universalis Markets, then go to the quest icon on the map and talk to Bragi.

Speak with Glynard

Go southeast until you can go southwest to where the orange arrow is pointing in the minimap and talk to Glynard. There will be a cutscene.

About Role Quests

You will be required to complete at least one role quest chain to proceed to the end of the story. Tanks can talk to Granson to start the tank role quest line. Physical DPS can talk to Lue-Reeq to start the physical DPS role quest line. Magical ranged DPS can talk to Cerigg to start the magical ranged DPS role quest line. Healers can talk to Giott to start the healer role quest line.

Speak with the Manager of Suites

Go southeast to where the orange arrow is pointing in the minimap and talk to the Manager of Suites. Say Yes to retire to your quarters and complete the quest. There will be a cutscene. This one is important, so it is recommended to watch it either now or via the Unending Journey in an inn room.

Aether Current Quest

With the completion of this quest, you can now start the blue quest "A Jobb Well Done" in the Crystarium. Completing that quest will attune you to an Aether Current in Lakeland.

Next Main Scenario Quest

After you complete the quest, you will need to be at least level 72 to proceed to the next quest. After you reach level 72, talk to the Manager of Suites to accept the next quest: An Unwelcome Guest.