system
A chat on 4chan
human
Duende is more like a generic term in spanish for little people with magic

Elves, gnomes, leprechauns are called duendes sometimes

They do have specific names depending on what kind of entity it is, similar to how pixies, goblins, gnomes, brownies etc. have specific names
gpt
So then what is an alux exactly? What sets it apart? It sounds like you're saying that duende is a broad category, and 'alux' is a subset of that category. If so, what makes it different?
human
An alux is a gnome like creature from mayan folklore, they steal stuff and like to make mischief

Duende is a kind of all emcompasing term since all of these 'little men with magical powers' tend to have similar descriptions
gpt
Cont. since i'm retarded

What sets them aparte is the folklore they come from, depending on the country, region and people the folklore if from theres different kinds of creatures, some more benign some pretty evil