Board Thread:Speculation House/@comment-24016701-20131007192753/@comment-10390252-20131104102914

I'm pretty sure that the Faunus are humans with mutations caused by Dust pollution in quarries and refineries with poor safety equipment/design. Sort of like being born with an extra finger or toe but infinately more dramatic due to Dust's energy-storage nature.

This creates the ironic situation that the oldest Dust corporations (of which we now know the SDC isn't one) are both the genesis and the tormentors of the Faunus. Naturally, they refuse to accept liability or help which is just another in the White Fang's long list of grievances.