Yoldahr live within the peaks of Kurosia, among their own living barbaric lives. They have long sworn off communications with their mother species and gods. However they knew attacking random Kuros would warrent giant hunts, and Yoldahr live in small groups. Yoldahr only attack Kuros when they feel threatened, and most Kuros tend to avoid the battles with them. 

Some Kuros will hunt them to prove themselves. Yoldahr aren’t considered Kuros since they had long sworn off protecting the balance and their Gods, they are well known for killing their own, so there’s no real punishment for attacking Yoldahr beyond it being dangerous and possibly troublesome if the Yoldahr clan lives near trading routes. Yoldahr venom can be injected and used as a breath, which can melt even Kuros scales. 

More info on the Yoldahr here!