I'd see shooting stars before, but never found anything when I got to place they seemed to touch down. While playing last night, I noticed a yellow beacon shooting into the sky. At first, I thought it was one of my Sheikah waypoints, but it turned out to be a star fragment!
I also stumbled on the Lord of the Mountain in that session too. Saved before coming up on it, but all I was able to do was get a pic for the Compendium, all the Blupees and the Lord himself bolted before I could do anything else (couldn't decide whether to toss a bomb in or use bomb arrows with my triple-shot bow). I should preface that I had NO idea what I was looking at beforehand, I just figured it was 'Blupee Prime' or something. I immediately reloaded my save, and was distraught to find the instance was gone!