There are 5 books in the Aona series. The newest book is Salvation's Door which came out in 2016.

1
Oblivion's Forge

Book cover of Oblivion's Forge
For thousands of years they have sought the world from which they were cast out. Now, at last, Aona has been found. The younger races of this world will all be swept up in a struggle for survival, as their ancient, malevolent masters, guardians of all Aona's secrets, rise to…
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2
Secret Roads

Book cover of Secret Roads
Gates have opened from the blackness of the void. The marandaal have reached out into Aona, and the great powers of the world awaken.

Caught between the destroying light of the marandaal and the malign influence of the choragh, ancient masters of Aona, are the men and women who will…

3
The Endless Shore

Book cover of The Endless Shore
The Endless Shore is the third book in the Aona series of dark fantasy novels by Simon Williams. The marandaal spread throughout Aphenhast and in the bitterly divided land of Harn, a small group of men and women seek to bring the unity without which the entire world will perish.…

4
The Spiral Heart

Book cover of The Spiral Heart

As the marandaal draw ever closer to Harn, Inerdyr is intent on crushing the renegade Watchers and mercenaries who have banded together in the name of a unified resistance to the starspawn.

In Luudhoq, the Seven fight and plot as cracks appear in their ancient empire.

Ilumor prepares to lead…

5
Salvation's Door

Book cover of Salvation's Door

The known Existence is likely dead and dark, every world turned cold and lifeless by the remorseless marandaal. Only Aona remains; a precious world that represents the only light and hope left.

Yet Aona is dying, and the disease spreads not only from out of the Gates, fathomless portals linking…