As a substantial expansion to Ark: Survival Evolved (released 2017), this content requires the base game and plunges survivors into 'Aberration,' a derelict ARK featuring a hazardous, multi-layered underground biome system. The core gameplay loop shifts to mastering extreme environmental challenges, including radioactive sunlight, utilizing new traversal tools like ziplines and wingsuits, and managing Charge Batteries for power and light. Players must contend with unique, dark-dwelling creatures, notably the light-hating 'Nameless,' while uncovering the secrets of this failing structure.