Draugr

Arguably the most unfortunate of the mutants, draugr are tattered humans who appear by everything other than their movement corpses. A zombie-like draugr might have holes showing through their limbs, but they still lumber on in search of biomass to consume. Their neurology, while reduced to minimal basic instinct, is actually maintained by a symbiotic evolutionary variant of F. longevitus. If one really knew what they were doing, they could collect a culture of it for various uses, or put the mindless draugr to meaningful labor.