Covers Volume 12-13 of the Light Novel, if you are wondering the timeline where this takes place then it's in between ep7 and 8 of season 4. Although Ainz did gave a caution of the scenes in the movie that are disturbing but imo this movie was a bit toned down albeit not excluding the important parts. The LN was even more dark and gory than the movie, not to mention that So-Bin's illustration was a perfect match to Maruyama's story. Anyways, it wouldn't be a surprise that some parts in the novel wasn't included since it covers 2 volumes but imo it wasn't that bad. The animation has rather improved and I guess I did have high expectation about the design of the Ultimate Shooting Star Super but it was foolish of me to compare it to the illustration of So-Bin 😅