Second book in the Sabis the Survivor series
Follow the Forani tribe after the earth gets shifted onto a different axis. Then compare the way the tribe members treat each other versus how the Survivor tribe members interact.
(Sequel to Loki's Sister)
After defeating Thanos, Lorien travels with her brothers back to Asgard in hopes of finding the cure for the mark of death. When they discover that the only being that can reverse the spell, is hidden on Earth, they realize finding a cure is harder then it seems. And time is running out.
(Sorry, I'm really bad at writing summaries.)