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As the name suggests, this serum is of unknown origin and composition, and boasts some very powerful effects. In addition to providing an extra 50 damage resistance and 5 Strength when injected, the serum also actively removes radiation at a rate of 10 rads per second, for one hour. This effectively makes it a prophylactic RadAway; given that there are few sources that give off more than 10 rads per second, the serum actively flushes the radiation out as it is absorbed.
- Only one mysterious serum can be received at a time from Lorenzo Cabot, should he be kept alive at the conclusion of The Secret of Cabot House.