Asuras

Asuras is the Asuran homeworld. During the war with the Wraith, the Atlanteans built a laboratory on Asuras, using intending to create nanites which would destroy the Wraith on a cellular level. Instead, the nanites took human form. Concluding that they would never be the weapon they wanted, the Ancient Council sent a fleet of Aurora-class warships to devastate Asuras. However, some nanites survived, and remodled Asuras into a new version of Atlantis.