Under the Never Sky by Veronica Rossi

Aria and Peregrine. Need I say more? Well yes of course I haven't been able to stop verbal diarrhea since my thirteenth year.
Aria is a dweller, dwellers live in mountain type things really. They have not been outside since the Aether storms started. They have these eye patches that are their world. Realms (this is cool) (well to a certain extent) and well basically crap immune systems.
Soren can hack anything. Even the dwellers systems. He take Aria and her friend along with his two friends to a shutdown pod that ain't protected. All hell breaks loose. Soren goes crazy, I mean CRAZY crazy spreads a fire. Everyone's trapped.