I don't know if this is even a good starting point, but this is my idea so far. Any suggestions/edits for length, style, grammar, etc. are greatly appreciated. Or if you think its trash that's fine too.
The Cybran Nation was created in the years just before the dawn on the Infinite War. Symbionts are the result of the merging of human conscious with an AI. They were first created by Dr. Gustaf Brackman in 2592, for the Earth Empire. These symbionts were enslaved by the Empire, being deemed a threat to the galactic order. When he saw what was done to his creations, Dr. Gustaf Brackman fled with a few of his closest symbionts to the deepest reaches of space. The Cybran Nation was formed. They seek on goal with a deadly focus: liberty. Their place in the Infinite War is freeing as many symbionts as possible, and working to secure their freedom. The Cybrans seek to accomplish this goal through guerrilla warfare across the galaxy, as their numbers are small. Their technology is reflective of their fighting style, favoring speed and stealth in favor of hp and damage output. Their units are very versatile, often having multiple side abilities.