In the extended cut (video version) of The Chronicles of Riddick, while Riddick is on his way from the Planet U.V. going to the Helion system, we see a dream (?? don't know what to call her ??) which Riddick is having about his home world of Furya. It seems to me he doesn't really know what it's about or about his heritage. Is there a reason for this? Is it a repressed memory? Why does it seem Riddick doesn't know he's Furyan? Is there any back story on this which I'm missing?
The Furyans are said to be a highly spiritual (warrior) race. The dream was a vision. We do know though that Riddick also carries repressed memories.
A lot of the backstory is from the Riddick games.