There are 13 gods of Orsterra. With the exception of Galdera, each god will bestow a class to the player by visiting their related Shrine. However, the four gods who teach the secret classes must be defeated in battle before the class is bestowed.
All five gods who physically appear in the game, including Galdera, are shown to wear masks.
Gods of Orsterra
The thirteen gods are siblings who were sired by Orsa and Finis. After the death of the former and the disappearance of the latter, they would continue the task of shaping the world, and thus Orsterra was born.
Approximately 1,600 years prior to the events of Octopath Traveler, Galdera attempted to seize the power of the gods for himself. The battle that ensued was concluded when Aelfric brought the Sacred Flame from the heavens and sealed Galdera away in the afterworld. However, Galdera had created a daughter, Lyblac, who has been working to free him from his prison beyond the Gate of Finis ever since escaping it herself. Lyblac's machinations behind the scenes play a part in all eight of the playable travelers' stories.