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Biotics are rare individuals with the ability to create and manipulate mass effect fields. Given the correct implants and careful training, a biotic can raise defensive barriers, yank opponents off their feet, or shred an enemy apart at the molecular level.
A biotic gains these abilities after exposure to dust-form element zero in utero, or via secondary exposures at a young age. Though this often results in fatal cancer, roughly 10% of those exposed develop element zero nodules along their nervous system. Once activated by the body's electrical impulses, these nodules allow the biotic to create mass effect fields, though most need a neural implant to wield them effectively.