Eggman Empire Fortress

The Eggman Empire Fortress is a location that appears in Sonic Forces. It is a colossal fortification on earth that serves as the Eggman Empire's supreme military headquarters. Near the end of the war to take back the planet, the Eggman Empire Fortress served as the site for the final confrontation between the Resistance and the Eggman Army.

The Eggman Empire Fortress serves as the location backdrop for several stages in Sonic Forces.

Description
The Eggman Empire Fortress is located in a barren gray wasteland with no flora or fauna, and has barren mountains surrounding it. In the center of this region lies the Eggman Empire Fortress itself. This high-tech fortification is located in the middle of a deep crater whose sides are surrounded by high walls. These walls extend into the depths of the crater, forming staircase-like levels, and the paths around the fortress consist of bridges that are fortified with lasers and robots. Rising up from the center of the crater is a massive high-tech tower with large metallic hoops rotating around it.

Deep within the fortress is the main reactor for the Phantom Ruby, powered by three Phantom Ruby prototypes.

Past
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 99% of the world.

Sonic Forces
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 the Eggman Empire Fortress in an effort to reach the power source for the Phantom Ruby that was located in the fortress' reactor. Upon arrival, they Resistance was met the Eggman Army, consisting of hundreds of replicas, led by Infinite. What followed next was a massive battle, with the Resistance's infantry confronting 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 create a virtual sun above the planet so that it would crash down and destroy the entire Resistance in one fell swoop. However, using a Phantom Ruby prototype, the Avatar was able to neutralize 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. In the end though, only Sonic managed to confront Infinite. Just 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 appeared 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 robot and the Phantom Ruby. 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.

Points of interest

 * Final Judgement
 * Imperial Tower
 * Iron Fortress
 * Mortar Canyon