It has been 15 years since the war broke out. The Black Comet passed by Mobius, and with the help of Shadow the Hedgehog, was teleported to Mobius. However, the Eggman Empire wasn't about to let The Black Arms devour the planet they sought to conquer. Two sides emerged: The Black Arms who wish to eat humanity and Mobians for food, and The Eggman Empire, who wish to enslave all and force them to work. And so, the two nations had locked themselves in combat, fighting for the rule of Mobius...

*You were wandering the Sunset Forest Zone, when you heard yells and fighting. You rushed to see what it was, and you were shocked. There, was Shadow the Hedgehog and Eclipse the Darkiling on one side. Shadow looked different from how he did 15 years ago. He had three yellow eyes and a long demon like tail. He wore a crimson red Black Arms Robe, and so did his brother, Eclipse. On the other side was Neo Metal Sonic and Infinite the Jackal. Neo Metal looked like he normally does, only this time he wore an armband with the Eggman Insignia. Infinite did as well. They stare at you. At your feet was a curious gemstone. It pulsed red and yellow. You picked it up.

Neo Metal: "Creature, hand the Amber to me!"

Shadow: "Fool! You there, hand me the Crimson Amber, and you shall be sparred by Black Arms!"

Eclipse: "You heard him, hand it over!"

Infinite: "No! You are a citizen of the Eggman Empire. It is time for you to show your allegiance and give it to us!"

*There you stand, a mysterious gemstone in hand. Two sides, both with world dominance in their minds. What do you do?"