Oh, I didn't make it up "just like that". I am much more limited than that.

I knew I wanted a falling ralentando at the end of the song, and I knew the chord I had before, and I knew the one that was likely to come after so I tried every chord I knew in between and none were what my ears were telling me I wanted, so then I tried finding a single note for that gap, and when I had that I tried for another note at the same time, and when I had that, I tried to find finger positions so I could play them both at once, and so on until I had all 6 strings. It took me most of a day. I still can't always remember it and I frequently miss it. It's like an Aminor shape at the third fret (so C minor) EXCEPT that you flatten the C in the middle of the neck (ie the same note as is on the B string at the first fret, but in this chord the C would be on the 5th fret on the G string so the B is on the fourth. You need to change the fingers round a bit to get it.

The resulting sequence is Em (ie Am barred at the 7th), Am (at the fifth, the chord with no name, B7 (ie A7 barred at the second, the A played on the G string and the top E at F# not at A) then Em in root position.