system
Given the following post, respond as if you're commenting on Reddit:
human
[Chronicles of Narnia] what exactly is the deplorable word and what was the price Jadis paid to learn it?

To be clear I'm not asking what it does or how it works, but what the actual word itself *is*. Like the letters and syllables of it.
gpt
We don't know the word and we don't know the price. All we know is:

* it was a well-kept secret that had long been known about
* Jadis had to "pay a terrible price" (the only description) to learn it
* it had to be spoken "with certain ceremonies" to be effective
* it destroyed all life on her planet except for herself.

Aslan also warned that an analogous power to the Deplorable Word was soon to be discovered on Earth. Shortly after that, nuclear weapons were developed and used for the first time.