The Scarlett Witches. The Eternals, #6

When a freak catastrophe strikes the Scarlett witches, Astrid and Thomas travel time to find the origins of the evil that eats away at the center of their existence. Ancient powers, that were never meant to be mingled, are misused and create havoc in the lives of the Scarlett witches and others like them. Many lives are cut short of forever changed in their quest for the knowledge that will restore the balance to their lives.
They encounter dangerous foes and powerful allies, pain and redemption during their struggles. Lives and families intermingle and grow in numbers and power. Ultimately, the Scarlett witches fight to triumph over adversity and forge new lives with far-reaching power that will withstand the new challenges to come.