This book is called Scourge. This book takes place on a continent named Dominaria where the five colors of magic ,red, fire, blue, island, black, swamp, green, forest, and white ,plains, have their territories.
Over the past 2,000 years, Dominaria has had many upon many scourges. The newest scourge being Karona. Karona is a She-God. Her powers come from what people believe that she can do. Kamahl, an ex-pit fighter, slayer of the mighty Chainer, sets out on a quest to retrieve the famed Mirrari Sword,the sword he used to destroy the evil Merfolkian, Laquatas.
Any where Karona goes, all races of beings swarm her, kill each other, just to touch her radiant skin. Even the most powerful of lords fall pray to her radiant light. When Kamahl goes into the cave deep wihin his homeland, he finds the corpse of Laquatas, with the Mirrari Sword imbedded in his heart. Kamahl took the sword, but awakened Laquata as he did so.But, since Laquata was already dead, he awakened as a zombie. Kamahl ran out of the cave, and into the desert.
Meawhile, Karona, on her quest to find another god like equal to her, fell cities in her wake.Wherever she went,her aura sucked the magic out of everything, stones, lamps, causing buildings to fall over and cataclysm wherever she went.
Kamahl soon figures out that he needs to fing the three ancient sorcerers. With the socerers combined powers, they could destroy Karona. Kamahl saves the first sorcerer from the belly of a wyrm.The second sorcerer is the young ruler of the Colisseum. The third sorcerer is an incredible city, where the final battle will take place.
After Kamahl gathers three of the sorcerers, he takes them to the third sorcerer/city to form a plan to take down Karona. Kamahl lures Karona to the city, so the plan to 'banish' her from Dominaria could take place. But instead of 'banishing' her, the sorcerers were going to 'kill' her. So, remembering he had to believe in Karona for her to be able to do anything, he believed she that she could break out the killing spell. So instead of dying Karona was teleported out of Dominaria but not banished. Not knowing that she wasnt banished, Karona wandered from world to world looking for a place for herself. While on her quest, she came upon a world made entirely of metal, where the god Karn recided. She learned from Karn that she was actually a plainswalker, a so-called 'super god' who has the power to heal or even destroy whole worlds. So with her new found power and knowledge when goes back to Dominaria. In a last, selfish, fight to destroy Karona the three sorcerers get killed by Karona. Kamahl then convinces her to become good and stop killing people.
So instead of killing, Karona has resorted back to rebuilding Dominaria, and making it better than it once was.