The Metamorphosis Plague is caused by a virus that rewrites the DNA of the subject transforming them from one race into another race. The first outbreak of this plague occurred in Year 4. During that time the plague was confined to the human species and others were unscathed by the outbreak.
A decade after its first appearance though the Plague returned. It was accidentally released by scientists trying to find a cure for the Great Animosity Plague that had broken out on Derra IV on Year 14 Day 1. The release occurred on Year 14, Day 25. This new strain of the plague though affects all known sentient species. Scientists Predict it will run its course within a month.