a small hint of a screenshot can help a little to finding ending C considering that most of us do not exactly know where in the world you get Ending C from with just words alone
A screenshot would help us know what the area the part is likely in to make it somewhat easier to finding Ending
(I genuinely cannot find it no matter how much I am trying to look for that part even in the cheat sheet, all in the entire 4th floor)
(Nvm I found it after an entire day trying to search through the entire floor, Almost had a crash out after searching for 5 to 10 straight hours yesterday, it was hard to find)