There are 2 books in the A River of Royal Blood series. The newest book is A Queen of Gilded Horns which came out in 2021.

1
A River of Royal Blood

Book cover of A River of Royal Blood
Seventeen-year-old Eva is a princess, born with the magick of blood and bone--a dark and terrible magic that hasn't been seen in so long, the knowledge on how to wield its power has been lost to history. She wants nothing to do with the magick or with the Ivory Throne…
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2
A Queen of Gilded Horns

Book cover of A Queen of Gilded Horns
In this sequel to A River of Royal Blood, Eva and Isa must find a way to work together if they want to save their queendom in the thrilling conclusion to this royal fantasy duology.

Now on the run, Eva is desperate for answers about her transformation and her true…