After fighting your way through the stronghold, you'll finally reach Dr. Darling, a key figure in Sloan's operations. This encounter might not be a direct boss fight, but rather a narrative sequence or a puzzle-like challenge. Dr. Darling might attempt to escape, activate defenses, or unleash experimental creatures on you.
Be prepared for a sudden ambush or a quick-time event. If it's a combat encounter, focus on Dr. Darling while simultaneously dealing with any security forces or creatures she unleashes. If it's a puzzle, pay attention to the environment and any clues provided. The confrontation with Dr. Darling will reveal crucial plot details and set the stage for the final act of the game. Ensure you've collected any important data or items from her lab before proceeding.