Avatars of Vana'diel

Within the realms of Vana'diel lie the sleeping gods. By obtaining a special tuning fork from Tarutaru researchers around Vana'diel one can muster up the courage and strength to face these mighty beings. An individual must ring the tuning fork upon an ancient crystal, a Protocrystal, being drawn within the realm of the gods and awakening them. Here, a brave soul must wager their lives in a game to amuse the gods. Should they win, a pact may be formed between the person and god allowing the person to call upon the god in a lesser form. This type of person is called a Summoner.

We all know the history of the legendary Karaha-Baruha who rode upon the beast named Fenrir, but what of the histories behind these avatars, the stories of how they came to be? What origins lie behind the sleeping gods of Vana'diel? To respect the original author's work I will to only link to the pages containing this information:

Conversations with a Ruby
And His Name Was Fenrir!
The Transformation of Ifrit
The Legendary Giant Titan
Leviathan, Guardian God of the Sea
Garuda, The Queen of Birds-A Tale of Granted Wishes
The Ice Queen Shiva-A Tragedy of Treason
The Hermit Ramuh