Some ideas for the faction description:
Raw text:
UEF
The United Earth Federation is a powerful human faction aiming to unify a splintered empire through conventional weapons. They pack a powerful punch when it comes to damaging structures with their artillery, supported by satellites. Or defending outposts with their unique Tier 3 rotating Gatling gun as point defense.
Cybran
Cybran units are often insect-like in appearance. They use laser, stealth and cloaking technology more than any other faction. Their stealth bombers are powerful and if their naval has killed everything on sea, some ships can simply walk on land to carry out even more destruction.
Aeon
Humans who follow the philosophy of the aliens. Their experimental unit Paragon can generate nearly limitless resources, but if it explodes it causes a nuclear strike. They use hover technology and can nullify shields or use guided missiles which are fragile, but do very high damage on impact.
Seraphim
Religious aliens who came with superior technologies to cleanse the galaxy. They have multipurpose units, the strongest shields and a gigantic experimental Bomber. The experimental building Yolona Oss creates the most damaging and devastating strategic missiles ever seen.