Land of the Elementals Series by Aaron Oster

Life is cruel. Arbor learns this lesson the hard way, when everything he loves is taken from him in a single night. Left alive by the men who butchered his family, Arbor has two options: give up and perish, or rise up and fight to take back the life he's lost. To do that though, he'll have to leave behind the only home he's ever known and venture out into the world beyond. What he doesn't yet realize, is that the world is a much more dangerous place than he could ever have imagined... moreLife is cruel. Arbor learns this lesson the hard way, when everything he loves is taken from him in a single night. Left alive by the men who butchered his family, Arbor has two options: give up and perish, or rise up and fight to take back the life he's lost. To do that though, he'll have to leave behind the only home he's ever known and venture out into the world beyond. What he doesn't yet realize, is that the world is a much more dangerous place than he could ever have imagined. A world filled with magic, monsters and mythic beasts powerful enough to destroy entire nations! Warning: Contains mild profanity and content that may not be suitable for children. less

With the defeat of the Elemental, Arbor should be hailed as a hero. Instead, he is shunned, turned away from the Defiants by those seeking power and fearing his own. Having little choice, Arbor sets out with his force of gremlins toward the slave city of Fivora in hopes of finally being reunited with his sister. Meanwhile, strange things are happening in the elven capital of Srila. An Infiltrator is stalking the streets and leaving death in its wake... moreWith the defeat of the Elemental, Arbor should be hailed as a hero. Instead, he is shunned, turned away from the Defiants by those seeking power and fearing his own. Having little choice, Arbor sets out with his force of gremlins toward the slave city of Fivora in hopes of finally being reunited with his sister. Meanwhile, strange things are happening in the elven capital of Srila. An Infiltrator is stalking the streets and leaving death in its wake. However, the Infiltrator isn’t the only one with its sights set on the elven homeland. Karria soon finds herself tested in ways she could never imagine. As enemies close in on all sides, she must find the strength to push through. The denizens of the underworld are stirring for the first time in thousands of years. Although their individual battles may have ended, the war has only just begun. Warning: Contains mild profanity, gore, and some content that may not be suitable for children. less