Husks are synthetic-organic "zombies" created from the bodies of organic beings. When a human is captured, they are placed on impaling devices, huge spikes that Alliance marines have nicknamed "dragon's teeth". Over time the body's organs, skin and water content are converted into cybernetic materials; blood is changed to a sickly green fluid, and the body generates an electrical charge.
When the spikes are approached — say, if marines try to recover their dead comrades — the husks are released and attack. The husks will charge at their enemies and, once close enough, give off a powerful electrical blast which disables shields and causes massive damage.
