"That's why I'm here. To be the one person who will not budge." Sierra established herself and the world as a power to be reckoned with, and now her problems are as big as they get. She knew returning to the world that betrayed her would be hard, but she didn't expect the most powerful mages would work against her rather than with her against their common enemy, the most powerful beings in the universe. With the angelic tyrants of the universe stealing a whole world's power, Sierra's magic alone isn't going to be enough to fight them, especially since she can't figure out how to make her magic work with Nariel's. Sierra and Nariel will have to bring together more magic than ever before and unite down to their souls to defeat the angels before they can destroy all the worlds, and to finish what she started: Taking back their power, once and for all. Take Back Worlds is the final book in Diamond Universe: Sierra Walker, a fast-paced, action-packed urban romantasy series spanning the modern world and also other worlds full of magic, with a shadow-wielding demon boyfriend and a heroine who never quits no matter the odds and just goes harder as they fight to change the universe for everyone. Expect the heat level to escalate dramatically in each book.