Legacy Virus - Description

Description

The Legacy Virus was actually a viroid and was released by Stryfe, a terrorist (and clone of Cable raised by Apocalypse) from approximately 2,000 years in the future. It originally existed in two forms, Legacy-1 and Legacy-2, but later mutated into a third form, Legacy-3; all were airborne agents.

Legacy-1 and Legacy-2 searched for a target organism's "X-factor," the sequence of mutant genes that gave a mutant his/her superpowers. If it did not find an activated X-factor in the target, the viroid would die off, leaving the person completely unaffected. If, however, it did detect the X-factor, it would begin inserting introns (junk DNA sequences) into the transcription codings of the victim's mutant RNA, the process commonly being triggered after the patient used their powers for the first time after contracting the disease. The result was a major compromise of the replication and transcription process so disruptive as to eventually render the body incapable of creating healthy cells, ultimately resulting in the death of the victim. Prior to death, the viroid causes its host's powers to flare out of control.

Legacy-1 attacked general transcription and replication of all cells, a messy and non-selective process that resulted in a condition akin to a fast-replicating cancer. This is the version that infected Illyana "Magik" Rasputin, sister of Piotr "Colossus" Rasputin.

Legacy-2 was much closer to Stryfe's original template and more in tune to his desire to stir a species war between humans and mutants. Its attacks were selective, working only on the X-factor genes. The net result was that a victim would eventually lose control of his superhuman powers. In addition to developing at a far slower rate than Legacy-1, victims of Legacy-2 developed skin lesions, fever, cough and overall weakness (symptoms displayed by the telepathic X-Man Revanche). The slow nature of Legacy-2 is why St. John "Pyro" Allerdyce survived for years following his initial infection.

Legacy-3 was a complete fluke, accidentally created in the body of the mutant woman known as Infectia. Her powers allowed her to scan and visualize the genetic structure of a living being and then alter it according to her own whims; she was essentially a walking genetics laboratory. Infectia had herself been infected with the Legacy Virus, which her own powers tried to stave off. In doing so, they caused a replication error in the Legacy-2 viroid that was killing her. The viroid's conditioning to infect only if the X-gene was found in the host was stripped. When Henry "Beast" McCoy opened Infectia's containment chamber in an act of compassion to allow her one final look at the night sky, he inadvertently released this new "free agent" strain. Legacy-3 was capable of infecting any living being that fit within the parameters of its general original template; that is, hominids only, not canines, felines, etc. Moira MacTaggert, long-time ally of the mutant X-Men and one of Earth's top geneticists, seemed to have been the first non-mutant human to be infected with Legacy-3.

Mystique had also created (or commissioned the creation of) a strain of the Legacy viroid that only attacked non-mutant humans, leaving mutants completely untouched.

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