Hi, I've forgotten the name of the novel but I remember the plot... any help would be greatly appreciated. Plot: A mutant apocalypse novel where the MC (female) dies and goes back in time to before the apocalypse happens. When she goes back she ends up in the body of a male teen who is in a coma(tile fell off a roof and hit him on the head) but has ice powers (awakens when the apocalypse happens) an older brother who's a mercenary and awakens healing powers and a sister who awakens lightning powers. They stay in some house with the brothers mercenary unit whilst hunting mutants. The MC knows that the crystals the mutants drop when killed can be consumed to increase the power of their awakened ability. Ends up using an ice staff to kill mutants.