This story is a sequel to Distorted World
In this sequel/prequel to Distorted World, Spike gets sent on a mission to the Badlands to be an ambassador to a village of dragons. But, what is this about a prophecy, and something about a chosen one sent to slay an evil dragon tyrant? Tired of being left behind all the time, Spike sets out on his own to prove that he can be a hero. He's always longed to be one, but does he really have what it takes? Will he find out what it means to be one of his kind? Or, will he discover something else entirely? One thing's for sure, there's more to this situation than meets the eye... Book Two of the 'Undestined Hero Trilogy'
Chapters (21)
Dragons are resistant to lava, the show has them bathing in lava. And surfing in lava. And spitting out lava after falling in. Also at the beginning it's says they don't know that he saved the world. They are talking to him the whole time.