Recently, I was directed to this Wikia page about Caius Ballad: http://finalfantasy.wikia.com/wiki/Caius_Ballad#Story
Some of the info there was clearly presented in the game. But there are some rather detailed things that I don't remember ever seeing in the game. Perhaps these details are indeed hinted during the game, so I will point some out from that page:
- The fact that Caius once fought against a very powerful warrior of the Farseers, who then sacrificed himself at the arrival of an enemy army to save Yeul and then Caius took his last name 'Ballad'
- "To protect Yeul himself, Caius performed an incarnate summon to destroy the enemy forces" - I mean, we do know he can transform into bahamut, but I don't remember anyone ever mentioning an "incarnate summon" spell performed by Caius or anything.
So, are those facts hinted somewhere at all in the game, or is there an external source about this? Where?