Series information from Goodreads.

Celia and Anya, friends who use tattoo magic to send divine messages, must rely on one another to survive when they discover the fake deity they serve is very real--and very angry.

Celia Sand and Anya Burtoni are inklings for the esteemed religion of Profeta. Using magic, they tattoo followers with beautiful images that represent the Divine's will and guide the actions of the recipients. Ten years into their servitude they discover the truth: Profeta is built on lies, the tattooed orders strip away freedom, and the revered temple is actually a brutal, torturous prison. They escape with the Rabble Mob, a traveling theater troupe, using their inkling abilities for performance. But The Divine they never believed in is very real, very angry, and determined to spread her deceitful influence even further. -- adapted from jacket