From publisher blurb:
The Dark Brood slither forth from the fecund womb of Shub-Niggurath; undulating and hideous copious, it births strange and impossible children.
Ever Their praises, and abundance to the Black Goat of the Woods. Iä! Shub-Niggurath! Iä! Shub-Niggurath!
The Black Goat of the Woods with a Thousand Young!
The Dark Brood offers a selection of content bringing the fecundity of Shub-Niggurath front and centre to your game and loosing her mindless progeny upon the world. The supplement includes: