Horizon Forbidden West continues the story of Aloy, a young hunter of the Nora tribe and a clone of the Old World scientist Elisabet Sobeck, as she leads a band of companions on a quest to the arcane frontier known as the Forbidden West to find the source of a mysterious plague that kills all it infects. On her journey across these uncharted lands, Aloy encounters new regions ravaged by massive storms and deadly machines, and conflicts with a tribe of nomadic raiders who have tamed the machines as war mounts. She discovers a vast array of environments and ecosystems, including lush valleys, dry deserts, snowy mountains, tropical beaches, ruined cities, and underwater settings.