The Legacy, Shadow of the Unicorn Book 1

A loud, hissing sound filled the air. The unicorns looked up, their eyes filled with horror. Azaria, a unicorn colt, is intrigued when the young, clairvoyant dinosaur, Darius, foresees a terrifying change to their world. When a giant fireball smashes into the earth, the unicorns struggle to survive the hurricanes and starvation that follow. But nothing compares to the danger when the creatures-that-walk-on-two-legs settle in the valley, and their leader discovers the healing power in the unicorns' horns. Greedy and ruthless, Ishmael will stop at nothing in his pursuit of wealth - even the complete extinction of the herd. Azaria must find a way to outsmart Ishmael before it's too late.