A deliberate, comprehensive installation that reactivates ancestral mammalian genes to shift the user's body toward a more animalistic baseline — enhanced body hair growth, elongated canines, broadened jaw, thickened nails approaching claws, enhanced smell and hearing at the cost of verbal articulation, and shifted posture favoring quadrupedal movement. The package is intentional — unlike chimeric splice, which is accidental chaos, the Feral Regression is a designed modification that moves the user's body plan away from baseline human toward a generalized mammalian predator. Gravemoss Biofoundry developed it as an experiment in atavistic gene expression and quietly discontinued it; the gene stock leaked to the black market. Some users embrace the modification as liberation from human constraints. Others took it under duress or deception. The end result is a person who looks and moves like something between human and animal, retaining full human intelligence behind a face that no longer looks entirely human.