The wiki say that a small number of them live in the Labyrinth, not that there are usual creatures in the Underdark.
If you look at a Map of the underdark and compare with the location of Menzoberranzan, the Labyrinth is supposed to be somewhere between Luskan and Neverwinter, so hundreds of miles in the North.
I hope Larian won't just pick "cool creatures" and dropped them anywhere to build BG3's world.
I guess no one care fighting 40 types of different creatures in act 1 and all of them doesn't have to be so unusual.... They don't have to pick everywhere in the MM to offer innapropriate variety.
Whatever we're talking about the underdark or the surface... There are tons of hostile creatures which could be implemented in way that suits more to the reality of the FR.
Last edited by Maximuuus; 17/12/20 08:24 AM.