Until We Shatter by Kate Dylan
Set in a richly imagined world where magic is divided by colour, Until We Shatter follows Cemmy, a young woman born a Hue, the child of a non-magical Typic and a magical Shade. This mixed heritage makes her a target - the Church wants her dead for having magic, while the Council of Shades sees her as impure.
When her mother falls gravely ill, Cemmy turns to thievery to survive. She’s offered a high-stakes job: steal a powerful relic hidden in The Grey, a shadowy alternate dimension where staying too long causes people to “shatter” and die. To pull it off, she must team up with Chase, a mysterious and alluring partner with secrets of his own. The heist could save her family…or destroy the city.
Until We Shatter is a bold and imaginative fantasy with a compelling premise, though it may appeal more to readers who enjoy complex magical systems over deep character arcs.