You proceed to the Gates of Judgement to join Lucia and the Ishgardian envoy before you continue on to Gridania.
This quest is available if you have completed the quest Tidings from Gyr Abania.
Starting the Quest
Talk to Lucia in Ishgard to begin the quest.
Wait at the Gates of Judgement
Go outside and use an Aethernet Shard to go to the Coerthas Central Highlands via the Gates of Judgement. Go to the quest icon on the map and check on the sparkling Destination. There will be a cutscene.
Speak with Aymeric
Go east to where the orange arrow is pointing on the minimap. Talk to Aymeric to proceed. There will be a cutscene.
Speak with Aymeric in New Gridania
Go to New Gridania and go to the quest icon on the map. Talk to Aymeric to complete the quest.
Next Main Scenario Quest
After you complete the quest, talk to Aymeric to accept the next quest: An Allied Decision.