Demons

They like memories. I mean Mordantis does.

Actually, for the most part they don't. Some of them do, but usually they tend to be more interested in traditional things, like blood and fire, and things that are traditionally valuable for magical power like dragon scales and magic items. In fact, while demons come in all shapes and sizes, those that have the ability to work with memory, especially without the consent of the other party, are very rare.