The Demonic Princesses are the main antagonists in the first BLACKSOULS game. They’re a group of five princesses based on various real-life fairy tales. You need to kill all of them to get certain endings in the game.
The members of the Demonic Princesses are:
The Demonic Princesses are considered the reason why the Lost Empire is in the state it is, and Cinderella is the strongest among them.
To reach Cinderella you have to light up all 4 crystals at the Gate of the Lost Empire, so you can get into her castle. To do this you either have to form a covenant with a princess or you have to kill her instead.
Covenants with princesses have requirements that can be difficult to fulfill but they have great rewards (and you will be able to make love to the princess). All princesses are unique both combat-wise and personality-wise.
Demonic Princesses can be replaced, as it’s seen in certain companion endings. New Demonic Princesses come to power and in Elisabeth’s companion ending she even becomes one herself. With enough power and determination, it’s possible to take the throne and become a new ruler of the Lost Empire.

