There are 4 books in the The Guardian Herd Series series. The newest book is Windborn which came out in 2016.

1
Starfire

Book cover of Starfire
The first book in a gripping new tween fantasy series about winged horses-perfect for fans of the Warriors, Survivors, and Guardians of Ga'Hoole series. This paperback edition contains bonus content-a short story about Star's beloved friend, Grasswing! Once every hundred years, a black foal is born, prophesied to either unite…
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2
Stormbound

Book cover of Stormbound
Perfect for fans of the Warriors, Survivors, and Guardians of Ga'hoole series, this sequel to The Guardian Herd: Starfire, which Peter Lerangis called "an epic tale," will have readers eagerly turning the pages. When Star received his powers on his first birthday, he became the most powerful pegasus in Anok.…

3
Landfall

Book cover of Landfall
The gripping third book in the Guardian Herd series-now in paperback-will have readers eagerly turning the pages. Perfect for fans of the Warriors, Survivors, and Guardians of Ga'hoole series. Includes a never-before-seen short story! It has been many moons since Star received his starfire power, and now he will face…

4
Windborn

Book cover of Windborn

Perfect for fans of the Warriors and the Guardians of Ga'Hoole series, the action-packed fourth and final book in this first arc of the Guardian Herd series follows Star and his nemesis, Nightwing, as they face off in an epic battle that will end everything.

Star and his friends have…