They bring peace?

Humanity has breached the reaches of space, this was supposed to be the golden age and era for humanity. However, one event led to another, and we are in a dark age, civil war, strife, hunger and famine reign supreme, and war and distress spread like wildfire. Mars was hell under the regime. Earth was barren and destroyed, a relic of what was and where they came from. The resistances are crushed out by corporations and authoritarian regimes spotted through the solar system, dark ages II it was coined.
Until they appeared. That was what changed the unchangeable.