Board Thread:Speculation House/@comment-10390252-20130728185452/@comment-15108745-20130830173241

There was actually a line in "This Will Be the Day" that got me thinking about the black ooze:

''Legends scatter: Day and night will sever. Hope and peace are lost forever.''

The line "day and night will sever" sort of had me thinking that the Grimm were this natural dark part of the world that might have been severed or released kind of like the Forest God in Mononoke. And now there's no hope or peace in the world, only war with these creatures.