Board Thread:General Discussion/@comment-26955524-20161126192429/@comment-26397825-20170227025444

Terminus99 wrote:

About the Grimm attacking Humans, I think someone theorized that they were attracted by the Darkness (negative emotions) inside them, but kill them because of the Light inside them.
 * Raises hand.

That was me. Basically, Grimm are attracted to more Grimm (as evidenced by the way large amounts of Grimm attract more Grimm to an area, and the Dragon attracts Grimm to itself), which I theorise they recognise because they can sense the Darkness, the negativity inside the other Grimm. Grimm are in turn attracted to negative emotions in humans because this is part of what the God of Dark gave humanity. But because of the presence of the God of Light inside humanity, since it was a joint venture between the two Gods, and the Grimm were created specifically to destroy the God of Light's creations it overrides any willingness they may have had to work together with or at least live alongside humanity peacefully and instead the Grimm seek to destroy them.