Angelgard

Angelgard is a peculiarly shaped island off the coast of Galdin Quay. It is a small barren island that has two peaks that could be taken to resemble wings. The island has but a prison and eight towering swords stuck on the ground around it. The player can't directly explore the island unless via a glitch.

Story
After his ten-year slumber inside the Crystal, Noctis Lucis Caelum awakens at Angelgard. The sky is black with not even stars showing, and he meets the dog Umbra that has a message for him from his friends to meet them at Hammerhead. Noctis discovers his father's boat, which he steers to Galdin Quay.

The presence of the colossal swords suggests a connection to Bahamut, the astral god whom Noctis met inside the Crystal. Bahamut was the one who had Noctis sleep in wait for his ascension to the throne as the True King, and thus it would make sense for Noctis to return to the world through a location related to Bahamut. The island's shape, if taken to represent wings, could also allude to Bahamut.

Eye for Islands
"Eye for Islands" is a quest for Vyv at Lestallum that becomes available after completing "The Perfect Landscape". Vyv requests a photo of the island taken from Galdin Quay. Completing the quest yields 1,500 EXP and 7,500 gil.

Etymology
Within the world of Eos, the island may have been named for its shape, perhaps seen resembling angel's wings. -Gard is a Germanic suffix often associated with placenames.

Trivia

 * It is possible to visit the island via an "out of bounds" glitch if the player swims there on a chocobo. It is not possible to fly the Regalia Type-F across it, but with the chocobo glitch the player can get a better look at the swords left on the site.