The logo of Hylomaxe is an overt Bio-Fixe reference
Immunity is a popular virch franchise first introduced by Umbral Experiential PLC (later Ombranex PLC) in 1261 AT. A black-comedy period piece set in the Technocalypse, it follows the absurd internal politics and outlandish demise of the fictional Hylomaxe Inc. Hylomaxe is a thinly-disguised stand-in for the infamous Bio-Fixe corporation, which was the source of the flawed replicator that would be the first domino in the Technocalypse, as well as the Black Rot, accidentally released during the Bio-Fixe lynchings. Like the company that inspired it, Hylomaxe is a (temporarily) successful multinational corporation in the nanotech and medicine spaces, and is hiding a number of problems, all of which explode into public view over the course of the series.
Most installments are set in the 560s AT and revolve around the lives of the lazy, cynical and incompetent employees of the "Quality Reassurance" department as they attempt to do as little work as possible, much to the chagrin of the scheming middle managers and psychopathic board of directors (in one arc, a lobotomized cyborg assassin sent to slaughter minority shareholders is instead promoted to CFO). The ensemble cast of slackers includes such characters as "Doctor" Jaci (mistakenly made team lead after an error in the company's genome sequencer convinces a nepotistic board member that they're related), Happy the provolved capybara lab animal (continually suffering from yet another experimental strain of the common cold), and Nelson the lovably cruel security enforcer.
The core series takes place over three months in 565 AT (or "January through March of 2534 CE"), as the company develops, tests and launches its newest product, Panacyta. The latter is hugely hyped both inside and outside the company, despite the fact that no company member seems to know exactly what it is. After the catastrophic release of what turns out to be a comically malignant nanoplague, the main cast are gradually forced out of their apathy into a series of increasingly desperate attempts at damage control and blame-shifting. The series famously kills most of its characters in various brutal ways; those that survive until the finale are almost all butchered by maddened civilians during the final board meeting in an overt reference to the Bio-Fixe lynchings.
The series received widespread praise for its seamless blend of workplace comedy and unflinchingly dark (yet never entirely humorless) depictions of the absurdity, brutality and collapse caused by pre-T corporations. While certainly not the first Technocalypse dark comedy, nor even the most explicitly violent one of the period (that dubious honor might go to the Ten Trillion Teeth grey-goo sim), it was perhaps the first to achieve both true mainstream success and broad critical praise, leading to a lasting "classic" status. Approval was, in some cases, tempered by the nauseating subject matter; numerous polities banned the "Internal Audit" module outright. Nevertheless, Immunity maintained a surprising cultural relevance up until the end of the Federation Era. Many viewed it as a cutting expression of the everybeing Federation citizen's oft-conflicted feelings about the rising power of megacorps and their increasingly incomprehensible transapient leaders. Others, by contrast, saw in the depictions of chaos and incompetence a parable for the sorry state of affairs that prevailed before the advent of the Federation.