This was requested by yigithan.kilinc!
0Sk is Hiroyuki Sawano's composition, while Nightmare is Kohta Yamamoto's work. Just like the previous video, these are short variations from episode 15. I like 0Sk here. It's different from other stem edits that could be heard, let's say, in Season 3 where it was used quite often. Also, the Nightmare bit with Grisha sits well here.
(What a fitting title for an OST, even if it's just for a couple of seconds. Having a parent yell at his child is indeed a nightmare)