Master... Kl'rt... We are now your family... Your people.
Praxagora is a sentient robot from the planet Ataraxia, which is in the Negative Zone. The Ataraxians mastered "stellar containment" technology and used this technology for everything in their culture, even themselves.
Despite all their destructive power they were a peaceful people. They lived in peace with one another and their natural environment. When Annihilus discovered this race of super-intelligent and incredibly powerful machines, he determined that destroying them would be safer than keeping them alive.
The people are wiped out except for Praxagora, who was locked in a prison with the sole survivors of other races. Praxagora and the others were found and freed by the Super-Skrull and chose to fight with him against Annihilus. Praxagora has since then been Super-Skrull's lover and they were taken captive by the Phalanx, she and Super-Skrull were freed by Wraith and have since joined Ronan the Acusser and Wraith to confront the Phalanx.
She died when Ultron took over her body during the assault and Ultron overloaded her internal fusion core to make her a bomb, but Super-Skrull saved everyone in there except her.
Ataraxian Physiology: The Ataraxians are a robotic Life-form who possesses all of the various superhuman attributes:
Miniature Star: Each member was powered by a miniature star that is carried in their chest. Thanks to their cosmic power sources, they could generate super-heated plasma from her chest and control it, using it in offensive and defensive ways.