Serpents of the Dawn by Adaline Winters

Cora Roberts, daughter of death and elemental badass, thought she had faced the worst White Castle had to offer. But when her grandmother, the head of the elementals, sets her sights on ruling over all supernatural factions, the stakes are raised higher than ever before.
As Cora struggles to navigate her newfound relationship with Hudson, the king of shifters, and protect those she loves from her grandmother’s machinations, she discovers that the true enemy may be closer than she ever imagined.
With danger lurking around every corner and alliances shifting in the face of power, Cora must use all her strength and cunning to survive in this epic battle for control. Will she be able to protect her friends, her family, and her mate? Or will she become just another casualty in her grandmother’s quest for domination?