This story is a sequel to I am the hammer. The edge of his sword... and unfortunatly, the partner of a purple unicorn with wings.
Magnus the red makes one final gambit to destroy the Imperium. All that stand in his way are a motley array of misfits who seem to pose no threat whatsoever to the primarch.
Yet there is perhaps someone who can stop him from undermining The Emperor's great work.
One of his own men.
40k X MLP crossover.