system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Where do the dementors come from? Did people made them or were they born?

I know they are kinda immortal since they can't be destroyed, but where do they come from?
gpt
They come from a species which feeds off of emotions.  That's a dementor, with their focus being happiness.

They can die, but only if there is no happiness for them to consume.  As happiness is a renewable 'resource', there is no fear for dementors.  If you remove a dementor from society, it will starve and die.

It is theorized that the dementor's kiss is a form of reproduction for dementors, as they are inteligent.