Board Thread:Speculation House/@comment-11188061-20131022124840/@comment-16502426-20131022143737

I've often thought of this. If Grimm aren't hardwired to attack humans, then perhaps the Faunus are somehow tied into the same thing that makes the Grimm different from animals (maybe even what makes some forests red).

Sentient being (humanoid) + factor = Faunus

Plant + factor = red plant

Non-sentient animal + factor = Grimm.

(Mineral + factor = dust?)

The reasoning for the different results being the level of consciousness. Plants don't think at all, animals are not sentient, and humans are feeling thinking beings.

So perhaps the Grimm, Faunus, and Dust all originate from the red forests.