The Obelisk Gate

"This worthy sequel to last year’s magnificent The Fifth Season goes underground, as earth-magician Essun and her companions settle cautiously into life in a strange, crystalline community called Castrima. There Essun has to learn everything she can from Alabaster, her former mentor, before he dies (using magical obelisks to break the world in order to heal it has taken its toll, and his body is slowly turning to stone). Meanwhile, Essun’s lost daughter, Nassun, is far away receiving her own magical education — and being sharpened into a weapon against her mother. The Obelisk Gate is a lightning rod around which storm clouds gather to burst and strike in the trilogy’s final book next year."