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"The vaccine for the T-Abyss virus. Requires special equipment to use."
The Prototype Vaccine can be found on Ryan's corpse in the laboratories of the Queen Zenobia.
Purpose[]
After injecting this vaccine, Jill becomes immune to the T-Abyss Virus. After vaccination, the laboratory with Jill inside it would be flooded with T-Abyss virus, but Jill will survive.