Stillborn Harvest was a terrorist attack by the Kasei Freeholders on Bioforge Hivegen's bio-reactors in 46 BFC. The attack used a novel enantiomeric fungus which was undetectable to Bioforge's security, marking the first known release of a mirrored chirality organism outside of a laboratory.

The Kasei Freeholders were a community descended from a partially abandoned Domino settlement attempt in the labyrinthine canyon system of Kasei Valles. They developed a fiercely independent and terranophobic culture, supporting themselves by selling bio-hacking, smuggling, and similar black market activities. In the political vacuum that developed in the early years of the Retrograde Diaspora the Kasei Freeholders began to sponsor content on MarsNet supporting Martian culture and agitating against the large corporations which were effectively running most of the colonies, all of which were primarily Earth based. They sponsored mutual aid societies which explicitly promoted a pan-Martian identity, and likely worked with Dominio and Greater Zhōngguó to exploit class differences and dislike of the United States in areas which were profitable for US corporations.

In the early 40s the Freeholders developed a plan to break the corporate food monopoly, a result of economies of scale and patents on many of the algae proteins, and insert themselves as a primary supplier of foodstuffs, which they were capable of producing in large quantities. Their engineers created Aspergillus D-kaseia, a bio-engineered organism with structure a mirror image of the common Earth mold Aspergillus. Being D-chiral, it was metabolically and immunologically invisible to Earth's L-chiral biology and antifungal biosecurity systems.

In 46 BFC they introduced D-kaseia into the protein paste producing yeast vats in the more distant and profitable southern hemisphere colonies of Hellas Planitia, Planum Australe, and the Eridania Sea mining complex. The mold did not immediately kill the yeast, which would have triggered alarms, but instead secreted an achiral enzyme inhibitor which preventing the yeast from synthesizing essential vitamins and amino acids and made the resulting protein paste nutritionally worthless. Signs of widespread malnutrition took many days to sweep the colonies, and the Freeholders' untainted food caches were then used to distribute food aid to members of their mutual aid societies, which rapidly grew in size.

In response the Peacekeepers were used to ship food supplies to the affected colonies and to destroy most of the Freeholder's above ground infrastructure. In the aftermath of the attack the Freeholders became increasingly isolated and lost most of their sources of revenue, and most of their outposts were abandoned by the mid 30s