Claire and Moira's path leads them to the heart of the Overseer's facility, where they will confront the mastermind behind the T-Phobos virus. This section is a gauntlet of the toughest enemies encountered so far, including multiple Revenants, Slingers, and heavily armored Afflicted. Resource management is absolutely critical here; use every grenade, firebomb, and healing item strategically.
You'll navigate through laboratories and control rooms, solving complex environmental puzzles that often involve manipulating computer terminals or activating security systems. One key puzzle requires you to input a specific code into a console, which can be found on a nearby document or by observing environmental clues. Moira's flashlight will be essential for revealing hidden pathways and stunning enemies during intense combat sequences. The climax of Claire's story involves a direct confrontation with the Overseer, which serves as a major boss battle. Be prepared for multiple phases and a challenging fight. The outcome of this battle will directly influence the ending of the game.