Nightblood

Nightbloods or the Nightbleeders, also known as Natblida, are Grounders with a hereditary condition displayed in the form of a dark-colored blood. Only Nightbloods can become Commanders as they are the only ones compatible with the Flame. The serum created by Becca, which causes a person to become a Nightblood, is also referred to as Nightblood. Two years after the Nuclear Apocalypse, Becca injected herself with a black substance, i.e. Nightblood serum, that genetically modified her blood, turning it black. This modification allowed her to metabolize radiation at a much higher rate, including the radiation emitted by A.L.I.E. 2.0, solar radiation, and remaining nuclear radiation on Earth. Afterwards, Becca implanted A.L.I.E. 2.0 into her neck. When Becca returned to Earth, she saw humans in hazmat suits in the distance and told them that she was there to help, and brought a case full of Nightblood serum in tow.