Defiant by Michael R. Miller

The great powers are stirring, and Holt and Ash are ready to return to the fight. A summons from the Life Elder sets them on a perilous mission, leading to steaming jungles and blistering islands where ancient secrets will challenge everything they know of magic and dragons. Talia, the Red Queen, is beset on all sides by pirate raiders and marauding mercenaries. Empress Skadi has abandoned her, battling uprisings in her own lands. As the noose tightens on Feorlen, Talia faces a difficult choice: let her people suffer or turn her powers against moral foes? Osric Agravain has found hope with his newly bonded black dragon, but some wounds run deeper than flesh and bone. Along the Fallow Frontier, he seeks the inner peace that has long eluded him. And within the sanctum at Falcaer, Paragon Adaskar is struggling to unite the fracturing riders. If he fails, ruinous chaos will break across the world. For when Elders and Paragons quarrel, kingdoms fall.

Last Stand of the Stone Fist by MIchael R. Miller

A troubled past. War in the present. A dark future. Brode grew up a bastard in Athra, looked down upon as a child of chaos. Sent away to the dragon riders as a squire, Brode counted it his luckiest day when Silas Brightbark of Coedhen vouched for him to join their ranks. Now a Champion in the Order he faces the largest incursion the world has ever seen. Sent on a far flung mission to the Disputed Lands, Brode and Silas discover a remote town not on any map. It's a town of outcasts, of broken people, of folk that order has forgotten. As a scourge swarm gathers nearby, Brode and Silas face the toughest fight and decision of their lives.

Unbound (Songs of Chaos, #2) by Michael R. Miller

Sometimes the world needs a little chaos. Holt and Ash saved the kingdom of Feorlen against all odds. Now they are outcasts, alone on an impossible quest to unite the Elder Dragons. But they are children playing in a game of Dragon Lords. Trapped between the riders, servants of Sovereign, and the scourge, even their luck cannot last forever. Their only hope is to advance their bond by any means necessary. In Feorlen, Talia faces a world unaccepting of a rider queen. Her councilors will not heed her warnings of Sovereign. Foreign powers threaten war and bloodshed. Pleas sent to rider headquarters fall on deaf ears. All the while, Sovereign regathers his strength in an ancient fortress. Enthralled cultists swell his ranks. Disillusioned riders flock to his cause. And his unwilling servant Osric Agravain scours the land for dragon eggs. There are new types of magic to be discovered and Sovereign intends to control them all. Only the mysterious half-dragon Rake has a plan to stop Sovereign. To pull it off, he’s going to need a team.

Ascendant (Songs of Chaos #1) by Michael R. Miller

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The start of a new dragon rider epic combining the best of Eragon and Pern with the hard magic of Brandon Sanderson and Will Wight. Holt Cook was never meant to be a dragon rider. He has always served the Order Hall of the Crag dutifully, keeping their kitchen pots clean. Until he discovers a dark secret: dragons do not tolerate weakness among their kin, killing the young they deem flawed. Moved by pity, Holt defies the Order, rescues a doomed egg and vows to protect the blind dragon within. But the Scourge is rising. Undead hordes roam the land, spreading the blight and leaving destruction in their wake. The dragon riders are being slaughtered and betrayal lurks in the shadows. Holt has one chance to survive. He must cultivate the mysterious power of his dragon's magical core. A unique energy which may tip the balance in the battles to come, and prove to the world that a servant is worthy after all.