Nightblood

Nightbloods, also known as Natblida, are Grounders with black blood.

History
During a flashback in Thirteen, Becca injected herself with a substance which turned her blood black. The black fluid was used by Becca to make herself immune to radiation on Earth. When Becca returned to Earth, she sees humans approaching in hazmat suits. She tells them that she is here to help. This was the origin of the first Commander and the start of the myth behind the Nightbloods. It is still unknown how the black blood was introduced to the local population.

When a Nightblood child is discovered, they are sent to Polis to begin training for the Conclave. For each batch, or "class", of novitiates, a Conclave is held when the last Commander dies, during which the Nightbloods fight to the death. The survivor would then become the next Commander. The belief among Grounders is that the Commander's spirit (in fact the A.I. chip of A.L.I.E. 2.0) "chooses" its successor through this process, and the chip is then transferred and implanted into the neck of the new Commander.

If a Nightblood flees or refuses to participate in the Conclave, they are considered cowards and traitors to the blood and is typically hunted down.

Notable Nightbloods

 * Lexa†
 * Ontari
 * Aden†
 * Luna