Black Arms

The Black Arms were a race of demons originating on the planet Earth who later became a spacefarers.

History
Emerging from the region on South America now known as Glyphic Canyon, the Black Arms worshiped Dark Gaia, from whom they drew their connection to the Chaos Force.

Coming into contact with the Echidnas, the two races worked together in furthering their knowledge of the Chaos Force and the Chaos Emeralds. Developing the power jewel technology based on the Master Emerald, the Black Arms developed various flying craft from their temples and cities in Glyphic Canyon. Ultimately they decided to leave Earth on one ship, the Black Comet, in the search for new sources of food and energy on other planets, but returned to Earth every 50 years in their orbit around the Sun.

Over time, using his powerful psychic abilities drawn from the Chaos Force, Black Arms scientist Black Doom took control of the whole Black Arms race, developing a hivemind among them.

In the mid-20th century, Black Doom came into contact with human scientist Gerald Robotnik, who was working on Project: Shadow on the Space Colony ARK. Black Doom and Gerald Robotnik used their joined knowledge of Echidna science to splice Black Arms DNA with that of a hedgehog and create Shadow the Hedgehog.

50 years later, in the early 21st century, the Black Arms returned to Earth with the intent of using Shadow the Hedgehog as an agent to initiate the ritual of prosperity. Shadow stopped them, however, and the Black Comet was destroyed along with the entire Black Arms race.