The Master
Main article:
Mariposa super mutant
The vats were rediscovered in
2102 by an expedition led by
Harold, a major
Hub merchant. Accompanied by
Richard Grey, a brilliant exile from
Vault City, he managed to crack the
Mariposa base security and infiltrate the lower levels. However, within the vats, the automated crane crashed into the two, knocking Harold out and flinging Grey into the vat with FEV. Harold woke up in the wastes outside the base, mutating due to exposure to FEV fumes, but becoming a special type of a ghoul-like mutant, rather than a super mutant. Grey, on the other hand, underwent extreme mutation due to prolonged exposure to the virus in the vat. His intellect grew exponentially, allowing him to comprehend even the most complex issues easily (or so he thought).
[37][38] Grey methodically researched FEV, experimenting with animals and eventually, captured scavengers that strayed into the facility. It wasn't until a few failed mutations that he discovered radiation count to be a deciding factor in the success of the change, leading him to pick subjects more carefully.
[38][39] When his
Lieutenant was created, he suggested a secondary reason for possible incompatibility. Reviewing available evidence, he concluded that failed mutations in relatively non-radiated humans are caused by the inoculating effect mutated FEV had on humans with which it came into contact.
[40] Such exposure was not enough to cause phenotypical changes, but enough to cause conflicts when the pure FEV in Mariposa attempted to change the DNA, resulting in the death of the subject.
[41]