Batch 5 is a particular formulation in a series of mixtures of Pituarin and Pinearin. The exact quantities of each, and any other possible ingredients, are not known. A potent and unpredictable mutagen, it was administered to several inmates at the Larkhill Resettlement Camp during 1993.
While the effects of Batches 1 through 4 are unknown, Batch 5 frequently caused the development of supernumary organs in those it was administered to, often accompanied by the atrophy of other organs. It was regarded as a success by the researchers and administration of Larkhill, although those it was administered to were not volunteers and gave no consent to be experimented on, and most of them died in agony.
In at least once case, that of the individual known only as “Codename V”, Batch 5 seems to have caused no deleterious physical effects, instead apparently enhancing strength and agility, although it is possible that the drug did drive “V” mad – or perhaps madder, as “V” may have already been insane at the time he was dosed.
No known samples of Batch 5 or instructions for its preparation survived the destruction of the Larkhill camp by “Codename V”.