Stoker Class dragons are hot headed fire breathers, and most of them are capable of setting themselves on fire. All dragons in this class are immune to fire. A Stoker Class dragon losing its fire is a sign that it is going to die, although its flames can be reignited by a Fireworm Queen's venom or by eating their Flame Gel combs.
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Book of Dragons
FantasyMost things we know about every dragon species I could find. (Dreamworks Dragons)