Blue Horrors are born of destruction, for they emerge when a shrieking Pink Horror is finally slain and its cackling body splits, with a last whoop of delight, into a pair of smaller daemons. Yet where the Pink Horror capered and laughed, its blue offspring are its temperamental opposite: squat, scowling things of sullen malice, forever grumbling and sneering as they shuffle into battle. Mortals who have heard their muttering name them Grumblers and Spinning Sourguts, and their foul mood never lifts.
Despite their diminished size, Blue Horrors remain deadly, hurling bolts of eldritch flame and clawing at any foe within reach. They embody the endless flux at the heart of Tzeentch's nature, for a Blue Horror that is itself struck down does not truly perish so much as transform once more, splitting in turn into a pair of tiny, guttering Brimstone Horrors. In this way a single Pink Horror may plague its enemies through three successive forms, each smaller and more bitter than the last, so that the servants of the Changer of Ways are never so easily banished as they at first appear.