From publisher blurb:
Have you ever contemplated the mysteries of the universe? What if science, religion, and magic were all different interpretations of the same mystery? What if the “God Particle” is real and everyone is right? Gravity Age: Dark Aether delves into these mysteries and introduces the Archon character class for the Starfinder Roleplaying Game. This accessory contains new material covering:
The Archon character class. The archon possesses a dark energy pool which is used to fuel its spell casting and dark aether bindings. Archons can choose one of two paths; dark aether cybernetics or dark aether sentinels.
18 new spells for the Archon, Mystic, and Technomancer classes.
7 new cybernetic augmentations with over 75 variations.
A few new nanotech options
10+ Feats
1 new character race the Dokkalfar.
Warning: The Archon character class requires the use of the Gravity Age: Cybernetics Emporium and the Gravity Age: Mutant Menagerie!!