Element. Flame of Elisar – Marie K. JETH

The book is supplemented with illustrations.
Hasara is a mystery...Here reside mages, each mastering a specific Element - Fire, Air, Water, or Earth. Rika Velios and her family are hardworking, respected residents of Karuna. Crafting potent elixirs is their family trade, affording them a peaceful life. However, everything shatters when Rika's sister defies their mother and secretly employs her magic. Dangerous creatures immediately pursue them. Barely escaping the first attack, the second encounter turns disastrous. Rika loses control of her magical gift, leading to the death of innocent people. They survive, but if anyone finds out, the girl faces immediate execution. To investigate the unprecedented crime, both sons of Elsira's ruler arrive in Karuna. Both Daivirs are the most powerful Water mages. Their sorcery is boundless, their word law! They cannot be lied to, and worse, they cannot be trusted. Rika must simply keep her distance. But she has no choice. She becomes their guide...