Wild dwarf

The primitives dwarves that inhabits of the Jungles of Chult and the Mhair and Black Jungles call themselves "dur Authalar", which roughly translate as "the People". Contrary to their cousin, the more common gold, gray, and shield dwarf, they adopted a complete different social structure, leaving behind the famous clan based approach. The "dur Authalar" lives in hunting band, from which members constantly shift. Leaving like animals, the wild dwarves are therefore engaged in a constant struggle for survival, and refuses to adopt the usage of most other civilization.

History
After the fall of Bhaerynden, some of the dwarves who survived managed to reach the Jungles of Chult. Once there, they abandoned their usual subterranean homes to adopt their current life style, and they quickly end up being nicknamed the wild dwarves.