Emerald Fire — Robin Buckallew

When Phoebe disobeys Anikka, she gets into trouble with a group of witches she never knew existed - the church witches. The witches are forced underground into a safe room, where they have to figure out a way to coexist peacefully with the church witches, or move. Anikka warns once they move, they may be on the run forever. Phoebe discovers some more features of her amazing emerald, as well as a special skill, while avoiding snakes that release poison gas, exorcists, and witch hunters. She also discovers a secret her best friend, Alba, didn't even know she had.