The Fae King’s Labyrinth by Elisa Rae

Someone stole Azulin’s true name. Cursed to ride with the Wild Hunt during each full moon, he is helpless against the Unseelie king’s will. Over the years, the curse’s grip has strengthened, making Azulin’s magic difficult to control. Fighting the curse has exhausted his spirit to the point that he despairs of breaking its hold on him. Then one full moon, the curse places him in a labyrinth, not a hunt. Perhaps this is his chance, or maybe just a new form of torture.
Calypso is a shapeshifter who can’t change form. Living as an unpaid caregiver and laborer in her sister’s household, her presence is barely tolerated in their insular community. When a strange fae threatens her pregnant sister, Calypso sacrifices herself. Perhaps an honorable death would give her life purpose. Instead, she ended up fighting for her life in a pitch-black labyrinth.