Of Gods and Kings - Lestallum
First Available: Chapter 3
Other Requirements: Complete Aftermath of the Astral War
Rewards: 2,500 EXP & 12,500 Gil
Warning: You can't complete this quest or any of Vyv's quests during the night time because the lighting is too poor to take a picture. Be sure to rest somewhere before heading out to take the Photograph.
After you complete the Aftermath of the Astral War quest from Vyv you'll be able to to accept Of Gods and Kings from him. For this quest what you have to do is travel to a Royal Tomb in southeastern Duscae. Stand in the photo spot and take a picture of the Royal Tomb's gate entrance to complete the quest.
Behind the tomb that you have to photograph for this quest you'll find a Talisman (it's marked Treasure on the map).