Skybreak

It never rains, but it pours.
In the deserts of Farghalli, droughts are a blessing. They are broken up only by the Skybreak-- a terrible occurrence of extreme weather that will crush anyone unfortunate enough to be outdoors when it hits. Neoguard is a safe haven- a city built of strong rocks that can hold up against the onslaught.
When Roan and her team return from a scouting mission, they find that Neoguard has been taken over and the majority of its inhabitants slaughtered. With the next Skybreak looming and no hope of recapturing the city, they must make for the Oasis-- a dark and mysterious place that no one has ever returned from. No one, that is, except for Roan and her sister, Ash.
The way ahead is wrought with peril, and the odds of survival are slim, but Roan has no choice-- she must make it. Giving in is not an option. Not when a storm is coming.