Board Thread:Speculation House/@comment-98.199.152.111-20150114055618/@comment-50.187.186.150-20150118010517

The "official" story is that dust was discovered after the grimm appeared and was used to fight them off. Maybe the reality is the other way around. Humans discovered dust, starting using it and in doing so somehow brought about the grimm. Or, maybe the grimm had always been there, but only started attacking humans because the dust enraged them somehow.

Or, maybe humans and Fauna aren't native to Remnant. Maybe humans and Fauna arrived, terraformed the planet and settled there (possibly the original, spacefaring civilization collapsed). Now, the planets original ecosystem is trying to reassert itself and the grimm are a manifestation of that.