Dragon Masters #13: Eye of the Earthquake Dragon by Tracey West

From Scholastic Inc.:

Time is running out for the Dragon Masters to stop the dark wizard Maldred!

Pick a book. Grow a Reader!This series is part of Scholastic's early chapter book line, Branches, aimed at newly independent readers. With easy-to-read text, high-interest content, fast-paced plots, and illustrations on every page, these books will boost reading confidence and stamina. Branches books help readers grow!Dark wizard Maldred has stolen the Gold and Silver Keys! With these keys, he can now control the Naga: a powerful dragon who can cause terrible earthquakes. The Naga lives in a secret temple in the center of the earth... and Maldred is on his way there! Drake and his friends Jean and Darma travel to the temple to try to stop him. What will they find there? Will the Dragon Masters defeat Maldred once and for all?