When Orks, Necrons, Chaos, and the Imperium collide on the verdant world that the ponies call home, secrets will be revealed, lives will change, and nothing will be the same. It is the job of Celestia and the element bearers to try to align themselves with one faction.

Note:
one, the cover art is not mine

two, this dates immediately after the season three premiere or, for the Imperium, in 007M42, there will be weapons that have been discovered by the forces present not in canon 40K, but they are similar