There are 4 books in the The Warminster Series series. The newest book is Echoes of Ghostwood .

1
The Last Keeper

Book cover of The Last Keeper
A young boy’s prophetic visions. 

Blind at birth, Daemus Alaric is blessed with the gift of prophetic Sight. Now, as a Keeper of the Forbidden, he must use his powers of the Sight to foil the plans of a fallen Keeper, Graytorris the Mad. 
An elven Princess with a horrifying…

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Ominous Omens Daemus, a low Keeper of the Cathedral of the Watchful Eye, isn’t the only one having visions. His nightmares speak of the ageless sorcerer, Vorodin, who may be able to help. But the answers he seeks may bring him—and the realm—to the brink of war.
Elven princess, Addilyn…
A challenge from the Ancients.Daemus Alaric and his band of dauntless companions venture to the Devil’s Horn, the mystical home of Trillias, the mercurial Ancient of Sport and Tests. Their quest—to recover the lost Tome of Enlightenment, cast into the bowels of the mysterious Laurentian Labyrinth by the fallen Keeper,…

4
Echoes of Ghostwood

Book cover of Echoes of Ghostwood
“Ye who walks within Ghostwood truly walks alone.”Master Mortus will not rest until Daemus Alaric is dead, but the Great Keeper will not make it easy for him. Narrowly escaping Trillias’s labyrinth, Daemus is now armed with a weapon that may turn the tide of the war—The Tome of Enlightenment.…