Rules Sourcebook
The rules of play: resolution, abilities, combat, damage, Rift Energy, starships, creatures, advancement and equipment.
The Galactic Game
Codex
The whole game as one book, or each of its four books on its own.
Player's Manual
27 ancestries with 53 sublineages, 26 origins, 16 classes with 143 subclasses, 93 feats, the equipment, 561 spells, the conditions and the progression tables.
Gamemaster's Manual
Running the table, turn order, encounter budgets, loot, worlds, travel, hazards and the void.
Bestiary
723 creatures with lore, habitat and stat panels.