Betrayers

The Sandarans, later labeled Betrayers, were a founding member of the Compact of Species that were exterminated by the Triarchs.

Description
The physical appearance of the Betrayers are unknown, as well as their technology and culture. They were described by the Triarch within the Redemption of Sol as "optimists."

History
The Sandarans are one of the founding races of the Compact, alongside the Harrom-el and Thricin. They ruled through the First and Second Ages of Expansion. After the war against the Devoured, the Harrom-el became increasingly paranoid of cybernetic augmentation, leading to the destruction of a Neo-Valthus fleet. Tensions escalated after it was discovered that the Devoured contamination in the Neo-Valthus fleet was fabricated by the Harrom-el, and eventually boiled over into the Great Betrayal.

The Great Betrayal was one of the most devastating conflicts in the Compact's history, with the two remaining founders of the Compact "fighting for the soul of the Compact." Eventually, with in the induction of the Vamanoa into the Compact, the Sandarans were defeated and exterminated. They were renamed the Betrayers, and history was adjusted to make the Triarchs in the right for their extermination.

Trivia

 * It is speculated that if the Betrayers had won the conflict, the Compact would be much more benevolent toward new species.