- "She drove me to it. May the curse of all the Powers rest upon her for ever."
- ―Jadis, speaking of her sister. (Chapter 5) [src]
Jadis' sister was born a princess in the world of Charn. Little is known of her, not even her name.
This princess was probably the younger of the two. She was known to be a clever witch, just as her sister was, though not as powerful as Jadis.
After Jadis' ascension to the throne, her sister rebelled against her, and the two engaged in a global power struggle. At the outset, both sides agreed not to use magic. At some point, Jadis' sister broke this agreement. Thus, her sister's armies had the upper hand in the last battles. Fighting in the great city of Charn itself, Jadis' armies were butchered and the princess with her officers reached the royal palace where Jadis was stationed.
"Victory" was the princess' last word, spoken to Jadis. Even as she and her forces overwhelmed Jadis', her elder sister also chose to break their pact and call on the power of the Deplorable Word to destroy not only her enemies, but all her own forces as well. Within minutes of entering the palace, the princess and all life on the planet had perished. Jadis alone remained living on the whole world of Charn.