I found it! The "Last Secret" of the Witcher 3 - Vivienne dies in Skellige after 7 in-game years. Provided you went with the Egg Ritual. CDPR Devs Philipp Weber and Pawel Sasko confirm.

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0:00 I FOUND IT!
0:17 Brief Backstory.
0:30 Vivienne dies after 7 years! (As Geralt said)
1:22 It looks a little shaky...
1:30 I caught her as she dies.
1:49 Hail, be praised!
2:05 Witcher Developers confirmed!
2:24 What I've tried so far, w/o much satisfaction
3:05 It appears other NPCs don't react differently
3:29 How I did it? How I waited 7 years.
4:13 The End of Time (Game Breaks), Intense Flashing.
4:45 Checking some graves and whatnot
4:49 Recap and doubts
5:52 I've got some problems.

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