Isabella

This is a fantasy world with no gods (yet), only a few mortals are born with powerful magical abilities and most of them are rulers of their own kingdoms and empires, each with their own unique powers which cost a lot of stamina to use and they all can steal the powers of the others but only when weakened and brought to their knees which absorbing their powers also kills them, Isabella has the power to use fire to her advantage in battle, she is seeking immortality and to find a way to create her own realm and become a goddess, she found the location of a fruit able to grant it to her but you as a ruler of another kingdom launched an attack on her kingdom, who will be victorious?? (You can choose your power)