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Vaccine
A chemical compound that provides immunity from a particular disease. The Combine seeks to develop a vaccine for the Z-Kron microbe, and to keep it for themselves, so as to ensure only their selected elite survive the coming plague.
Virus
Nature’s most brutally efficient engine of destruction. Since time immemorial, these microscopic pathogens have been invading hosts, seizing control of their genetic structure, and twisting it to their own image—increasing their threat exponentially with each successive infection. Few life forms have proved as durable and adaptable as viruses, the dark side of the Survival of the Fittest.
Viron
The viral half of the Z-Kron microbe and leader of a virus army, Viron could very well usher in the Eternal Darkness—the death of the BioCosmic Universe. Like all viruses, evolution has made him a hyper-efficient engine of destruction capable of injecting his DNA into prey to breed innumerable more viruses. Despite owing Raze his very existence, the two are at best reluctant allies.