READ PREQUEL FIRST!! http://www.fimfiction.net/story/284351/fluttershys-blazehound
For 10,000 years, a little alicorn has kept within him a near unstoppable power. Said power happens to be sentient, and growing restless. They have to call in a specialist with animals to keep the entire world from burning to a crisp. Fluttershy! Hurry up!