Path of Exile: Betrayal is a substantial expansion for the core Role-playing Game, released in 2018, requiring the base game to access. This update introduces the Immortal Syndicate storyline, where you assist investigator Jun Ortori to infiltrate and dismantle a clandestine organization. The core new mechanic involves managing captured Syndicate members—choosing to interrogate, ally with, or betray them—to uncover their ranks, locate hidden Safehouses, and ultimately confront the mastermind for unique rewards. This system integrates deeply into the existing endgame progression.