For eons, the Sine have watched the galaxy burn.

Civilizations, empires, entire species have come and gone, and the Sine remain.

They are the galaxy’s dirty secret, a myth, thought to be created by a long dead empire as living weapons; a foreboding presence at the heart of the galaxy where nothing exists but black holes, exploding stars, and radiation.

However they are also the galaxy’s silent guardians, protecting the galaxy from threats that have long been forgotten.

The Sine are a species made mostly of a uniquely dense and strong crystalline structure with unique conductive properties. This particular crystal is only found in very few places in the galaxy, and most within or near the galactic core where the constant high energy radiation allows for its growth.

They are living energy weapons, for the crystal structure can store vast amounts of energy, allowing them to exist with no sustenance. The same energy can be manipulated along with the crystal of their bodies to reshape themselves at will, often forming lenses to project energy at foes, creating armor or tools at will.

From time immemorial they are known to mobilize only to the use of weapons of astronomical destruction. Forming punitive fleets meant to deliver justice and destruction to those who would do so. Scientists hypothesize that it is the influence of the Sine that has allowed the galactic culture to flourish without the threat of nuclear annihilation, or worse.

However, the Sine are becoming more active. Shards, giant ships made of crystal, are seen as far as the galactic rim. Other events, like the Andromedan invasion has triggered massive mobilizations against their use of highly destructive weaponry.

Groups and individual Sine have started circulating among the galactic population, unheard of a few thousand years ago. Where some civilizations might see the Sine once in an age, now they can be seen active at all galactic trade hubs. Even so, they are still regarded with a mix of uncertainty, distrust, and awe.