system
Given the following post, respond as if you're commenting on Reddit:
human
[The Sandman] Why do the Endless never refer to Death by name?

If I recall correctly, they only ever address her as "sister" and refer to her between themselves as "our sister". None of the other Endless get this treatment. Why is this?
gpt
While they're perhaps the closest beings in the cosmos, the Endless are not truly immortal. They can't really die in the *conventional* sense- it's probably not possible to kill Dream through force, you can only kill Dream's current human aspect- but even they won't last forever.

One day, however many trillion years ahead, the last being will dream, or despair, or desire, and that will be it. One day, Destiny's book will reach its last page. And that will be that. Then, they will die. And who will be there to end them?

Ultimately, there is only one being in the multiverse that can- indeed, inevitably *will*\- truly kill the Endless. You can't blame them for showing a little fear and respect around her.