Crystal Palace

The Crystal Palace, also known as Lunar's Lair, is a location in the game Final Fantasy IV. It is where Fusoya guards the Lunarians in their Lunar Sleep. It is also where the eight Lunar Crystals are enshrined. It also contains recovery points.

Final Fantasy IV
Cecil, Rydia, Rosa, and Edge arrive here and meet Fusoya, who has apparently been expecting them. Fusoya tells Cecil and his friends the truth about Kluya, Zemus, Golbez, and the Crystals. He then agrees to accompany them to defeat the Giant of Babil.

After the Giant is destroyed, Cecil's party comes back here, where the Lunar Crystals divulge the rest of the story, and guide Cecil's party to the Lunar Subterrane where they can defeat Zemus.

Final Fantasy IV: The After Years
Golbez and Fusoya will both leave the Crystal Palace upon heading to inspect the Impact Crater, but both return when the Mysterious Girl appears and attacks them with Leviathan. Upon returning to the Subterrane and defeating Zeromus's Malice, Fusoya teleports Golbez away, and the Crystal Palace is destroyed.

Music
The background music that plays inside the Crystal Palace is the "Prelude".