The Death Egg (デスエッグ Desu Eggu) is a massive orbital fortress, constructed by Dr. Ivo "Eggman" Robotnik. It is a massive spherical space station and resembles the face of Doctor Eggman, with concave eye-sockets and a mustache rendered in kilometers of vacuum-hardened plasma-steel.
In Sonic Battle
In Sonic Battle, the Death Egg makes a brief appearance at the end, although it is just a small arena for the game's final bosses, Doctor Eggman himself and then a berserk Emerl. The arena is completely open, and requires strong attacks to compensate for the lack of shelter.
This incarnation of the satellite is equipped with the Final Egg Blaster, a powerful laser capable of destroying stars or planets.