There are 6 books in the Legends of the First Empire series. The newest book is Age of Empyre which came out in 2020.

1
Age of Myth

Book cover of Age of Myth
One of fantasy’s finest next-generation storytellers continues to break new ground.

Michael J. Sullivan’s trailblazing career began with the breakout success of his Riyria series: full-bodied, spellbinding fantasy adventures whose imaginative scope and sympathetic characters won a devoted readership and comparisons to fantasy masters Brandon Sanderson, Scott Lynch, and J.R.R.…
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2
Age of Swords

Book cover of Age of Swords
USA Today & Washington Post Bestseller

The gods have been proven mortal and new heroes will arise as the battle continues in the sequel to Age of Myth--from the author of the Riyria Revelations and Riyria Chronicles series.

In Age of Myth, fantasy master Michael J. Sullivan launched readers on…

3
Age of War

Book cover of Age of War
New York Times | USA Today  |  Washington Post Bestseller | Goodreads Choice Award Nominee
The epic battle between humankind and their godlike rulers finally ignites in the masterful follow-up to Age of Myth and Age of Swords.
                 
The alliance of humans and renegade Fhrey is fragile--and about to be…

5
Age of Death

Book cover of Age of Death
DO GODS TRULY EXIST? CAN YOU KNOW THE FUTURE? AND WHAT LIES BEYOND THE VEIL OF DEATH? 

Winter blankets the land, and more than hope has died. Barred by the tower of Avempartha, the western army cannot invade the Fhrey homeland. So it must seek a way across the Nidwalden…

6
Age of Empyre

Book cover of Age of Empyre
A door opens. An army of dragons advance. And the fate of the living rests with the dead.
 After obtaining the secret to creating dragons, the leader of the Fhrey has turned the tide of war once more--but gaining the advantage has come at a terrible price. While Imaly plots…