To dominate they have to make mankind their slaves. Dani wasn’t able to allow all of this so she rose against the odds to protect mankind. This time she needed more power in the form of Sword of Light, though she got the power she was forced to sacrifice too. At the end of the war, she had to sacrifice herself and no one can change her fate afterward.
The deed is signed and the immortal Ryodan cannot save his beloved no matter how hard he tries. Darkfever and Kingdom of Shadow and Light focused more on the story and this time Karen Marie Moning has tried to portray the characters in a better way. Amanda Leigh Cobb and Jim Frangione have narrated separate characters in great coordination thus don’t expect any mixing of voices.