If The Crystal Empire Ended like Mass Effect 3

Red Destroy: Spike dies, King Sombra dies, All Of The Crystal Ponies Die, Trains explode.

Blue Control Spike dies (Spike lives as some sort of Space God or something), King Sombra Controlled, The Crystal Ponies live, Trains explode.

Green Synthesis: Spike dies, King Sombra turned good, and everyone is mutated with green eyes and skin, Trains explode.

Refusal: King Sombra wins and all the world is consumed by hatred and fear forever, Trains don't explode.