Lost Villages

So I have an idea which is an underground village or a tribe that could be neutral or hostile to you.

The Villages could be underground or isolated from the world (In the Jungle , In the Mountains)

Loot: Because gold was valuable for some empires there could be a temple with loot in it.

Underground villages: There could be a huge crack seeing sunlight.

Villager look: The villagers could have different outfits to the village or the tribe they're in.

Accessiblity to the underground villages: There could be a tomb or an underground stream.

Interface with villagers: They could be hostile or give you missions for some valuable equipment.  (Collecting items, helping on hunting)

Sorry if i did a mistake explaining English is not my first language.