So, having covered Frostbite, figured I'd have a crack at another of The Seven and went for the other end of the thermometer with Brimstone here. He's changed a bit from his original design posted over here: (horrific oldness alert) --> http://drakhenliche.tumblr.com/ but this is now much closer to what I had in mind for him :)

World buildy stuff:
The red dragon Fiero, better known as Brimstone. Of the Seven he was second in age and size only to the ancient, monstrous sea dragon Maelstrom (one of the last Orphic-Exalted still living on the material plane). As Tymaeran dragons age, so their physical forms may change and evolve to match their temperament and nature. By the start of the Dragon War, Fiero was classed already as an Elder Dragon and had reached a point where parts of him constantly burned like living embers, wreathing him in smoke and flame. His home south of the Dragon Mountains had become a barren, ashen waste under its master's influence. He generally considered the antics and intrigues of younger dragons getting involved with 'lesser' races to be beneath him, something for juveniles, but he had to acknowledge the steady eradication of his species and decided to align with the other dragons to put a decisive end to it.

The Old Empire didn't fall without a fight however and in a final, daring act of defiance a cadre of wizards made a last-ditch effort to fight the Seven by giving their lives to create a spell powerful enough to doom their assumed leader, Brimstone. The dragon still lives but is frozen, ensnared in a tomb of enchanted obsidian hidden deep in the heart of the Dragon Mountains.
Through their individual networks of spies and collaborators, the green dragon Witchblight and black Bloodbane had both gotten wind of this plan and could have stopped it but the Empire was already doomed. Witchblight had no love for the arrogant red, envying his power and Bloodbane had his designs set on the fallen imperial throne and thought Brimstone might endanger his plans so neither lifted a talon to help. In the long run this turned out to be a bad move as the region that once formed Brimstone's vast territory is now home to the legions of demons who broke through the Dreaming Gate. So, whoops, someone really dropped the ball on that one.