Originally Posted by
Nalien
Do we know when Sin Eaters first appeared? The Flood of Light seems to have literally been just that, I don't see much need for Sin Eaters to exist when a blinding Light is engulfing the land in a Flood... Minfilia stopped that flood though, and I imagine the crystal tidal wave we can see in not-Thanalan is the result of that.
I'd imagine Sin Eaters came about after the Flood was halted, in an attempt to get it going again. I don't believe the Firsts Warriors mentioned anything about Sin Eaters when we encountered them, they simply mentioned the Flood leaving nothing in its path. It sounded like there was nothing they could fight against with it, and Sin Eaters are very much something you can fight against.