Death Magic — Holly Hook

Alyssa is now faced with an impossible choice. Save her battle partner and her love, Xavier, or save the world. After defeating the Thoreau and the dragon Gaozu in Turkey's most ancient ruins, Alyssa and Xavier return to Cumberland with nothing left to do but to rescue their parents from the dreaded Infernal Dimension. But not only is Thoreau, the demonic mayor, a lot less defeated that the two of them hoped, there is something terribly, terribly wrong with Xavier. Alyssa's always dismissed him as confusing and moody, especially since he's just pushed her away AGAIN--but when Xavier goes over the edge and sinks into a despair that makes him helpless, it's clear to Alyssa there's more than teen angst at work. Xavier's kept a little secret from Alyssa this whole time. He's cursed to turn into a horrible creature soon and only Alyssa, who is descended from the most powerful Abnormals ever to live, can save him from his past. Easy, right? NOPE. Saving Xavier means that Alyssa must go to Thoreau and let him awaken another terrifying part of her, a part from a distant and terrifying relative she has no interest in meeting. And if that happens, she's one step closer to becoming the being who can help Thoreau enslave the world. Things are bad enough now that Alyssa is a vampire with a fire magic. This will make Alyssa even less normal. It will make her face the fact that she may be the most horrible monster ever to live. And it may force her to give up the chance to have anything close to a Normal life ever again. It's an impossible choice.