i read Greatshadow by James Maxey not too long ago. fun read and it features elemental dragons. the series is titled Dragon Apocalypse so you know you're in store for dragon goodness.
"The warrior woman known as Infidel is legendary for her superhuman strength and skin tough as chain mail. She’s made few friends during her career as a sword-for-hire, and many powerful enemies. Following the death of her closest companion, Infidel finds herself weary of life as a mercenary and sets her eyes on one final prize that will allow her to live out the rest of her days in luxury, the priceless treasure trove of Greatshadow.
Greatshadow is the primal dragon of fire. His malign intelligence spies upon mankind through every flickering candle, patiently waiting to devour victims careless with even the smallest flame. The Church of the Book has assembled a team of twelve battle-hardened adventurers to slay the dragon once and for all. But tensions run high between the leaders of the quest who view the mission as a holy duty and the super-powered mercenaries who add power to their ranks, who dream only of Greatshadow’s vast wealth. If the warriors fail to slay the beast, will they doom mankind to death by fire? "
Maxey's Bitterwood series is also great (and dragon based).
"Dragons rule the world, united under the powerful dragon king Albekizan. Humans have been subdued for centuries, existing only as slaves, pets, and prey. Yet one man, the mysterious Bitterwood, strikes at dragons from the shadows, fighting a long, lonely war of resistance. When Bitterwood is blamed for the death of Albekizan’s beloved son, Bodiel, the king launches a full scale campaign to rid the world of the legendary dragon-slayer—even if he must kill all of mankind to do so."