The Unseelie War by Kathryn Ann Kingsley

When love and vengeance collide, three worlds hang in the balance.

Ava Cole thought her biggest problem was dropping out of college. Then she got pulled into the Web—a realm between dreams and nightmares—and discovered she’s the prophesied Weaver, destined to reshape reality itself. Now she’s caught between two ancient demigods locked in a battle that threatens to tear apart everything she’s ever known.
Serrik, the exiled spider-fae, has spent two millennia plotting revenge against those who imprisoned him. But his carefully laid plans spiral into chaos when he finds himself falling for the very woman he was meant to use as a weapon.
Valroy, the Unseelie King, has finally been unleashed from centuries of restraint. Created as pure entropy, he seeks to burn down all three worlds—Earth, the fae realm of Tir n’Aill, and the Web itself. The only thing that might stop him is his wife’s love… if she’s willing to sacrifice everything to save everyone.
When Ava’s desperate attempt to force a confrontation goes catastrophically wrong, reality shatters. Three worlds merge into chaotic nightmare, and the only way to save them requires an impossible choice: three women must become eternal prisoners, anchoring the worlds apart with their very souls.
But in a universe where gods play chess with mortal hearts, even the ultimate sacrifice might not be enough.
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The third and final book in the addictive Web of Shadows series—where dark magic, political intrigue, and forbidden romance collide.