The Malmillard Codex — K.G. McAbee

Valerik: an escaped slave who tries to steal from the wrong woman. Madryn: a warrior on a secret quest, with a past she wants to forget. Garet: an underage thief with the arrogance of an emperor. Their uneasy alliance is the only hope against total annihilation, when thirteen stars appear in the sky of a malevolent realm and a portal rips open which can destroy a multitude of worlds...