From a galaxy of endless war comes Ezra Coran, an increadibly powerful and skilled Imperial Psyker doing battle on a world threatened by creatures worse than mere evil.

From the comparatively cutesy land of Equestria comes King Sombra, the greedy, hateful former regent of the Crystal Empire with phenomenal powers of shadow magic.

Two simultaneous crossed spells at two different points in two different worlds somehow resonate, they tear a hole in the barrier that separates them, and these two sorcerers are switched, each taking place of the other and exposing them each to the radically different worlds of the other.

What madness is this?