A force of great evil which despises colour and the ponies who wield it, eliminates colour entirely, leaving equestria in ruin. The only way of stopping this evil is by breaking the Wall of Dimensions itself, and sending one weak message...
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Credit goes to EuTytoAlba of deviant art for use of his image of the Rebellion Logo, and ClusterBuck also of deviant art for allowing open use of her OC, Princess Hope.