Dragon Weather. The Obsidian Chronicles, #1

The dragons only emerged from their deep caverns when the weather was right, with thick clouds and sweltering heat. It was on such a day that Arlian's home village was destroyed, his family and friends slaughtered. He survived, though, and swore vengeance on the dragons, and on the looters and slavers who had captured him in the ruins. But no one had ever slain a dragon; how could a mere slave hope to do so?