Warhammer 40,000: Rogue Trader - Lex Imperialis is the second story expansion for Warhammer 40,000: Rogue Trader. It introduces the Adeptus Arbites faction, providing approximately 15 hours of narrative-driven gameplay. The expansion includes new allies and mechanics, such as cybernetic eagles and mastiffs, and a new companion named Solomorne Anthar, an Arbites officer. Players will engage with new mechanics tied to the Adeptus Arbites and the Great Harvest process.