Weapons of Light by Ava Dune

After discovering the ugly truth about the deadly fae trials, Jasmine and Kieran find themselves at the Unseelie Court. To win the war of the realms, they have to act together.
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Revealing the secrets of the fae trials changed everything. I thought dealing with the guilt would be my only problem, but now, the realms are at war.
The queen is preparing her armies. Her beasts are running havoc across the dark fae realm, killing and abducting the Unseelie, crumbling their will to fight by poking holes in their united front.
A monster haunts my dreams. I have to muster my magic and decipher the message before we are too late.
Amidst the palace intrigue and the looming threat of war, the answers we seek are buried in a fog of secrets. If we are to succeed, we need to lift the veil.
But the Winter Castle is a cold, unwelcoming place. Resentment toward us grows as the attacks increase. We are not wanted here, and Prince Kieran cannot protect us for too long.
Luckily, I never expected anyone to protect me. And I’ve had enough of secrets and lies. It’s time to find some answers.