The Crystal Tower

Gem, the heir to the Grimlands, ran away after her father's death. And after two years of trying to survive on her own, she finds a cliffside tower. She dedicates her life to the magic inside, striving to become a peacemaker in a turbulent world.
But after she makes a massive mistake, a horrible evil is unleashed on the world. One that magic alone cannot fix. Alongside her twin brother FWhip, A joking emperor, a powerful farmer queen, and a mysterious elf, Gem sets out to right the wrong she herself caused. And if she doesn't, the world as they know it will burn.

Cover is not mine