Mod review time
The Drez'kth'ar Horror : https://www.nexusmods.com/skyrimspecialedition/mods/128464
A sizable quest mod that takes place in a new worldspace. Its an extended dungeon crawl(10 to 20 hours) where the ultimate goal is go back to tamriel.
There is minimal NPC interaction and what little there is remains unvoiced. The dungeon crawling is divided into 3 main sections, overworld, entrance and depths. The enemy encounters are dwemer machines, skeletons, ghosts and ash spawns. Aparently there are chaurauses too but I didn't encounter a single one in my 15 or so hours of playtime.
With no NPC interaction whatsoever the story is told through journals. The most recent events that transpired on the island took place in the 3rd era and you're just exploring the fallout of it.
With that in mind all the mod has going for it is the level design which is respectable. Its not badly designed. The biggest issue ends up being the heavy amount of backtracking you have to do if you want to explore everything. The mod is slow paced to say the least. The areas are designed with "story" in mind rather than player convenience. There is a quest which requires you to find 4 items in the depths section of the mod and then backtrack to the overworld to conclude the quest(and then backtrack to the depths again to leave the area)
The maps are large but not dense which just makes them devoid of anything a lot of time. The way it promotes exploration is through keys. You will encounter many gates that can only be opened with keys but you won't really know if opening them will lead to progression or just more backtracking.
Overall its probably the best its concept can be executed in vanilla Skyrim without straight up copying dark souls.
I give it a 7/10 but I don't recommend anyone playing it unless you have a lot of patience(as in you can finish Abya)