The "Legacy of Kain" is a series of action-adventure video games developed by Crystal Dynamics and Silicon Knights. The franchise follows the story of Kain, a vampire who seeks to reclaim his lost kingdom while grappling with themes of fate, power, and morality. The series is known for its rich narrative, complex characters, and dark fantasy setting. The main games in the series include Blood Omen: Legacy of Kain, Legacy of Kain: Soul Reaver, and Legacy of Kain: Defiance. Players navigate through various realms, solving puzzles and engaging in combat against enemies, including the vampire hunter Raziel, who plays a crucial role in the overarching story.