Tribes: The Dog Years

Over a hundred years after a viral apocalypse shortened the human lifespan to 21 years, the remnants of humanity survive in small tribes amidst the junkyard ruins of the techno-industrial age. One day everything changes for Sundog of the Sky Shadows. Is there new hope for longer life? Can the condition, the "plague," be cured or reversed with the help of an "Immortal" from a city under the sea?