Lupescu.exe

Whether by accidental bite or deliberate transmission in a sterile Bureau laboratory under care of licensed Nostrae and X-Rays, you have been infected with the Lupescu nanovirus. Your BEACON software has been fundamentally altered as a result of nanomites in your system supplementing your BEACON hardware.

Your school of nanomites has been programmed to augment Lupescu by stretching the limits of your physical form and mental acumen. You may experience any or all of the following extreme (situational) side effects: nail growth, increased intensity of emotion, minor iron deficiency, increased speed, agility, and/or strength, improved vision and hearing, and sensitivity to natural radiation (which interferes with nanomite functions).

Nanomites make your nails grow into lethally sharp claws. You gain a Predatory Strike equal to your hit die as a replacement for your Unarmed Strike.
You can detect Lupescu when it is present in others. You learn Infernal as a (programming) language and gain the 'Pack Tactics' ability.
Your vision becomes greatly enhanced with nanomite augmentation. You gain 60 feet of Darkvision.
Exposure to natural radiation (moonlight, nuclear radiation, magnetic radiation, and solar radiation) can seriously damage your nanomites. Upon exposure you suffer 2d10 Radiant damage that cannot be halved or evaded in any way.