Board Thread:Lore Discussion/@comment-5632187-20130203042433/@comment-16047389-20130920180020

And Solaire can use Great Lightning Spear...because he's the god that grants the Miracle.

Seriously though, I sincerely doubt they'd do something as dumb as make the main character the firstborn son. That would mean doing away with so much customization that players come to expect in an RPG.