Long ago in a distant land, I, M'kar, the shape-shifting Master of Chaos, unleashed an unspeakable evil! But a foolish Grey Knight warrior wielding a magic sword stepped forth to oppose me. Before the final blow was struck, I tore open a portal in space and flung him into the Warp, where my evil is law! Now the fool seeks to return to real-space, and undo the evil that is Chaos!
40k crossovers are the worst kind of threads.