Guardian Bacteria

And in their arrogance the apothecaries of the Second Republic made all manner of ward-pacts with incorporeal guardian daemons, inoculating them within their very flesh, that they might thereby be spared the wrath of the myriad other infernal powers they had evoked, enslaved and enraged. 

Rumors have reached my ears concerning the rediscovery of these arts by the "healers" of the Guilds. O ye nobles who would partake of such magick: Need I remind ye of the fate of those who first employed these occult techniques?