Death Egg

The Death Egg was a massive airborne weapon created by Dr. Ivo Robotnik in 3235. Capable of roboticizing all life on Mobius, the Death Egg was one of Robotnik's largest and most destructive weapons. Although it successfully made it airborne, the Death Egg met with destruction when Tails set it to self-destruct while Robotnik was distracted battling Sonic.

Development
The Death Egg's development began some time in mid 3235. Production of the super weapon fell behind schedule when Robotropolis was struck by a massive earth quake. Shortly afterwards however Robotnik ensured that his SWATbot work force picked up the pace and completed the Death Egg on schedule. (StH: #37, SQM: #1)

After the Mecha Sonic fiasco, the Death Egg was ready to ascend into the sky. Dr. Robotnik left his nephew Snively in charge of the city's reconstruction efforts (the city was almost completely destroyed when Mecha Sonic and Mecha Knuckles smashed into it) while he personally oversaw the Death Egg's launch. (SQM: #1, SMM)

Use and Destruction
While Sonic and Tails were searching for Power Rings to reverse the crystallization effect King Max was suffering from, Tails was pulled on board the Death Egg when it sucked up the remaining Power Rings from the Ring Grotto. Sonic on the other hand was searching out Carl Condor for help, only to be attacked by the roboticized Carl and brought to the Death Egg as a prisoner. Sonic managed to escape Carl Condor's grip and grab onto the Death Egg, whilst Tails disguised himself as a SWATbot. (SQM: #1, #2)

Because the SWATbot who had the Ring Grotto sucked up also brought up a large amount of debris, the Death Egg's ascension into the sky was slower than expected. Additionally, Robotnik needed the power of a Chaos Emerald to power the Death Egg's massive roboticizer. Thus, Dr. Robotnik sent a contingent of Burrowbots to the Floating Island to obtain a Chaos Emerald while the excess debris was jettisoned. The Burrowbots were destroyed by Knuckles and the Chaotix, much to Robotnik's disappointment. However, by this point the debris was jettisoned, and thus Robotnik decided to sink the Floating Island by pressing it under water with the Death Egg. (SQM: #1, #2)

Just before the Floating Island was submerged, Tails smashed through the glass "eyes" of the Death Egg and used the SWATbot's weapons to destroy the control panels. This enabled Sonic to escape from a Plexiglas confinement and saved him from suffocating, and also caused the Death Egg to automatically ascend upwards towards the upper atmosphere. Robotnik still had some backup plans, unleashing the massive Silver Sonic to safeguard the Death Egg. Sonic decided to fight the robo-replica himself while he sent Tails to find a way to destroy the Death Egg. Although Sonic was no match for Silver Sonic physically, he used active electrical cables to short circuit the massive doppelganger after Silver Sonic had punched Sonic through the floor, making the cables accessible. Robotnik then used his Eggsoskeleton battle suit to fight Sonic, but was evenly matched when Sonic went inside the body of Silver Sonic and personally controlled it. The fight came to an abrupt end when Tails informed Sonic the Death Egg was rigged to explode and Sonic sent Robotnik flying out of the massive super weapon. Sonic managed to grab a large number of Power Rings from a storage box and escape just before the Death Egg exploded. (SQM: #3)