This rare is located on 73.06 53.29 (see map) in Zereth Mortis and part of the Adventures in Zereth Mortis achievement. Which is part of the meta-achievement Path to Enlightened achievement to unlock flying in Zereth Mortis.
This rare is moving around the entire area around the raid Sepulcher of the first ones.
You can enter this island by unlocking the flight path (Ancient Translocator) via the main questline, or you can fly there once you unlock flying.
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