On the last throes of the battle of the Shield World that held an armada of Forerunner Dreadnoughts the Covenant wanted to activate, a ragtag sortie of soldiers and armored vehicles known as the 'Hell's Jesters' are unknowingly left behind as the planet falls apart. When a certain figure intervenes at a cost, the members of the group land in Equestria, scattered and very hostile to almost everything, on an unlikely mission to save a world again while battling their inner demons.

With an onslaught of disastrous events, can the Jesters live up to the fulfillment of the Lifeworker who had sent them here and stop the impossible?