Quote Originally Posted by Veloran View Post
So how does that explanation account for the Crystals of Light and Ryne/Minfilia's supped-up Oracle powers, both of which are described as the Blessing of Light?
The Crystals of Light are some sort of amplification of the Blessing; it's not clear exactly how they work, but it's clearly directly connected, as pretty directly pointed out by Y'shtola when Ysayle uses her Crystal.

I think Minfilia and Ryne have both the Blessing of Light and additional powers on top of that; possibly Hydaelyn-provided, possibly unrelated.