While nightmares are part of the stoker class the ash nightmare is actually part of the boulder class, this dragon is fast and tough, unlike it's stoker class cousins this dragon doesn't flame up but can heat themselves up pretty quickly and while the ash nightmare can eat fish this dragon loves to eat lava like it's fellow boulder class dragon the eruptodon.
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The book of dragons
AdventureHere is the information of all the dragons I know from each class and some fan made classes and dragons some from others and some I made myself.