On Wings of Thunder — M.D. Grimm

Trystan is an unchosen angel—shunned by society, bullied, and without a future. In a hidden well, Trystan discovers a carving of a dragon, who were once the commanders of demons and now believed extinct. But Trystan learns the carving doesn’t depict an ordinary dragon. Stories tell that millennia ago, the great dragon Asagoroth and his demon army nearly conquered the three realms but was killed by the five elders. The powerful angels combined their life forces to cast a spell, sacrificing their lives.But history is full of falsehoods. The five elders only managed to imprison the dragon, and Asagoroth had cast his own spell—one of releasement. It only needs the blood of a certain angel to liberate him from his cage….Asagoroth, enemy of angels, conqueror of realms, is free. But even as the angels prepare for war, the great dragon surprises them with an ultimatum: hand over the angel who awakened him or face annihilation.Note to readers: this is the second edition, fully revised and updated.