Human-San'Shyuum alliance

The Human-San 'Shyuum alliance was a military alliance between the human and San 'Shyuum species before and during the time of the Human-Forerunner wars. The alliance ended once the Forerunners destroyed the human civilization, restricting the rights of both members, making sure that neither would be able to join forces again.

History
The humans, who already at this point possessed a vast interstellar empire, formed an alliance pact with the San 'Shyuum race, hoping to take advantage of the species' highly-advanced technology.

On the former Precursor world Charum Hakkor, which served as the capital of the alliance, both humans and San 'Shyuum interacted with an entity known as "The Timeless One", actually the last Precursor that had been imprisoned there millions of years prior, and reinforced its cage with a time bolt.

After the Flood emerged into the galaxy, both humans and San 'Shyuum were the first species to be affected. Unaware of its true nature, both species used a primitive form of the Flood to alter the behavior of the Pheru, animals popular as pets among humans and San 'Shyuum. Over several centuries, the Pheru began to exhibit signs of Flood infection, which soon spread to both humans and San 'Shyuum. Humans discovered a way to fight the parasite, and sacrificing a third of their population, managed to drive it off the galaxy.

During their conflict with the Flood, however, humans became desperate and forcibly colonized worlds where the Forerunners had relocated other species. This resulted in a war between the alliance and the Forerunners. Even with their advanced technology, humanity and the San 'Shyuum were outmatched against the Forerunners. The humans refused to surrender and had their entire civilization dismantled and the last of their species exiled to their homeworld Erde-Tyrene as a result. However, the San 'Shyuum were more cooperative, and their punishment was less severe; they were stripped of their weapons and means of interstellar travel, and quarantined to their home system. This was to make sure that neither species would be able to join forces again.

Even without the war's effects, the Forerunners predicted that the alliance would crumble after a few centuries, based on their view of humans as a xenophobic race.

List of appearances

 * Halo: Cryptum