Lone Wolf Stuff

A glorious golden horn shattered forth from the Spartan's helmet, swirling with a blue aura like waves thrashing in the sea.  The soldier could not so much as think what it could mean, the euphoric release from the agonizing pain in her skull left her legs and her mind limp, and collapsed to her knees in a daze.  Her body trembled violently forward, her hands forced to the ground like she was bracing for some great weight to fall upon her.  Suddenly two pikes of bone and flesh speared out of her back, and they began to shape and form, cracking and popping into the shape of golden wings many times the span of her arms.

As the Spartan rose from her metamorphosis, the Nightmare Alicorn wailed in despair, her inevitable defeat now very clear to her.  The Demon had become a powerful Alicorn.

The Spartan spoke in many voices that all belonged to her, "I am the Princess of Humanity.  I am their shield, I am their sword."

An open hand extended and rose up to the sky, and materializing out of a purple haze, a Sniper Rifle appeared in her grip.  The barrel was aimed across the expanse of field, to the head of the defeated Nightmare.  A bullet traced a line of white dust from the chamber of the gun to and through the skull of the false ruler of Night.

And so the nightmare was defeated and the darkness melted away into oblivion.  Though victorious, the Spartan's body could not sustain itself in such a powerful state, and was disintegrated within seconds after the Nightmare was destroyed.  When the sun finally shone it's light after the dust had settled, only the Spartan's cracked and scarred armor was left on the battlefield.  It would later be incorporated in a monument to the efforts of humanity to protect Ponykind from both the Covenant and itself.

After the end of the Human-Covenant War, the Master Chief would arrive and stay in Ponyville for vacation while the events surrounding Reqium and the Infinity persist.