Valtron/Miasma

The Valtrons were a series of machines created by Dr. Ivo Robotnik during his takeover of Sonic's World prior to the War to Take Back the Planet, incorporating synthetic duplicates of the Phantom Ruby which channel the power of the original, kept in the third Death Egg.

The first Valtrons were duplicates of the Phantom Ruby itself, called 'Phantom Ruby prototypes,' with no autonomy of their own and to be harnessed by a user; however little information on these prototypes exists as the last of them were destroyed during the War.

Infinite series
The first autonomous Valtrons were created using the DNA of Zero the Jackal in the Revelation Laboratories underneath New Metropolis' Eggman Empire Fortress. Most of these Valtrons were destroyed with the destruction of the Laboratories, but the ultimate unit in the series, Infinite, played a large part in the takeover of the planet and the subsequent War.

Mega Death Egg Robot
The Mega Death Egg Robot, or Mega Eggrobo for short, was initially created as part of the Death Egg Robot series to be fuelled by Life Force through the Nega Wisp Armour. Following Eggman's defeat during the Lost Hex Incident, however, the Mega Eggrobo and Nega Wisp Armour were rebuilt as a Valtron powered by the Phantom Ruby.