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At some point, Dr. Eggman conducted experiments on Infinite in the Eggman Empire Fortress. These experiments resulted in Infinite being fused with the finalized prototype of the Phantom Ruby, giving Eggman a servant that allowed him to conquer over 99% of the world.


In Sonic Forces, Dr. Eggman began setting up his final plan to eradicate the Resistance at the Eggman Empire Fortress, resulting in his headquarters in Metropolis being undermanned

Eventually, the Resistance launched an all-out attack on the Eggman Empire Fortress in an effort to reach the power source for the Phantom Ruby that was located in the fortress' reactor. Upon their arrival, the Resistance met the Eggman Army, consisting of hundreds of replicas, led by Infinite. What followed next was a massive battle, with the Resistance's infantry fighting the replicas on the ground, and the Resistance's air fleet engaging the Eggman Fleet in the sky. When Infinite grew annoyed by the opposition, he went through with Eggman's plan: using his powers, he created a virtual sun above the planet that would crash down and destroy the entire Resistance in one fell swoop. However, using a forgotten Phantom Ruby prototype, the Avatar neutralized the sun. With that, the Resistance and the Eggman Army resumed their battle.

As the battle raged on, Sonic and the others broke into the Eggman Empire Fortress to defeat Infinite while he was weak from creating the sun. The Resistance fleet did what they could to cover the heroes, but eventually had to retreat. In the end though, only Sonic got to confront Infinite. Just as Infinite regained his full power however, the Avatar came to Sonic's aid. Together, the two heroes beat Infinite, who faded away after his Phantom Ruby was pulled into the fortress' reactor. After that, Classic Sonic helped the Resistance locate a way into the fortress. Using this passage, Sonic and the Avatar found the fortress' reactor and destroyed it, seemingly ending the Phantom Ruby. However, Eggman soon after reappeared in a Death Egg Robot and revealed that the fortress' reactor was just a decoy; the real Phantom Ruby had been incorporated into his Death Egg Robot, which was now producing thousands of replicas, which were overwhelming the Resistance. However, Sonic, Classic Sonic and the Avatar were able to destroy the Death Egg Robot. This made all the replicas fade away, ensuring the Resistance's victory over the Eggman Empire. In the aftermath at the Eggman Empire Fortress, the Resistance bid farewell to Classic Sonic as he returned to his own world, before setting out to clean up the mess Eggman had left the world in.