The ponies are forced to ally themselves with a strange new creature in order to stop a plot that threatens the lives of everypony in equestria.

When Twilight Sparkle unknowingly befriends one of the most wanted ponies in all of Equestria, dark secrets of her nation's past come to light and she learns how far her government will go to keep things quiet

A power once thought to be lost to the fog of time and war returns to a world on the brink of ruin, setting forth a chain of events that will determine the fate of this world, and ones unknown. A Half-Life 2 Adaption/Crossover