Drust would be cool if there was more lore on them. But despite the fact that their Witches take up the entire zone, and the zone is much less varied than Nazmir, we get a lot less flavor lore on them. Basically amounting to "They had evil magics, killed defenseless villagers because they were evil, and got their asses kicked once people started fighting back". With no real characters among them, except maybe a very few. While Nazmir actually sets up proper subplots and characters for them.
Drustvar sucks right now. There's no comparison with Nazmir where Nazmir doesn't look a thousand times better. I don't just mean in that Nazmir was designed to be more epic while Drustvar is mysterious and low key. I mean that in the sense that Nazmir has characters with memorable personalities, villains that aren't just some savage that was genocided the moment someone fought back and actually seem worth being scared of, and it makes one hell of an introduction to various aspects of Troll culture and their general attitude. We even see hints as to the origins of the Blood Trolls in various places, getting an impression of who and what they were.
Random fucking quest targets in Nazmir are better built up as threats than the Drust King. Loa who have already been killed are given more character.
Drustvar is currently in need of a major revamp. I'd recommend giving the Drust more actual lore. Probably have their spirits play a more visible role, since the Wicker Constructs just seem to be mindless constructs. Not Drust possessed. Build up an incursion of these ancient spirits as a real threat. That would probably add some variety to the zone as well. If there werre beings actually possessed by the Drust, and talking as if they were possessed by the Drust, that would help.
Celtic, actually. The art style may be based on the Witcher, but the constructs are called "Wicker Men" and are visibly powered by sacrifices inside of them. Which is Celtic. The word "Drust" is Celtic. The name of the local White Stag spirit, Athair, is Celtic. The blue and painted skin in the Drust concept art is Celtic.
The particular brand of Celtic is probably Pictish, in case anyone's curious. Drust is the Pictish form of the word after all, a name held by several Pictish Kings. Picts are also known for resisting occupation and being extinct. And not having actual written records for the most part, mostly just pictures on stones. Like the Drust.