Precursors (Spartan G-23)

The Precursors are recorded to be the most advanced species to inhabit the Milky Way. They were praised by the Forerunners for gaining the ability to leave the Milky Way long before they could. The Precursors created weapons, vehicles, and star ships that were powerful beyond belief.

Anatomy
Precursor anatomy is similar to that of the average human, but differ in certain qualities. They stand at a large 2 metres tall, and are ambidextrous. Each Precursor has two hands with five fingers, but they have much shorter and more muscular arms than that of a human. They originally came from the planet, Onicrenus, which had a thick, and often unbreathable atmosphere by the time humans discovered it due to polution, which also caused them to be as they were when they left the galaxy. Precursor's have much longer, and more muscular legs then humans, and have a well built body. The red blood cells in their bloodstream are much different then most species, and can convert a wide variety of gasses into an oxygen-nitrogen mix which they breathe.