Summoner's Bond (The Endless War #4)

Those who fight the darkness have scattered as the ancient power grows stronger.

When Ciara is abducted by summoners of dark power, they seduce her with lessons on how to summon the elementals, an education she never received in the barracks. Only a distant part of knows that she must find a way to escape before they manage to turn her to their side.

Alena has gone to the Seat of the Order to help stop the threat uncovered there, but she discovers the threat goes deeper than any realize, and for her to succeed and free the order, she may have to destroy it first.

In Hyaln, Jasn finds an old friend, but she is not the person he remembers. Hyaln offers to teach, and he discovers strength that he never believed he possessed, but it still might not be enough, as they discover they fight not only the threat of darkness, but those who seek to control it.

The penultimate book in The Endless War series.