The Book of the Sails - Eric R. Asher

A demon unleashed. A queen restored. A quest into a realm of fire and death...
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The Burning Lands once again beckon Vicky as she and Zola fight to release Tessrian on the realm of the fire demons. Traveling aboard an ancient ship known as the Bone Sails, the infamous pirate Graybeard takes the helm. But all is not what it seems.
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Together, they must fulfill Vesik's promise on their journey to obtain an ancient and powerful coin that can restore the power of a Titan and sever the magic of the Mad King. Time is running short, and failure will shatter the world around them.
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But the Burning Lands have sunk their spindly claws into Vicky once more. Danger lurks around every corner after the fall of Prosperine left the realm in chaos. Completing their quest falls on the shoulders of a forgotten destroyer, a necromancer's master, and a pirate who's stolen history might prove the end of them all...