This rare is located on 44.0 75.0 (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.
How to summon The Engulfer
1) Yoiu will see in chat when the Engulfer is active. It will say "The Matriarch's vengeful shriek echoes across Zereth Mortis "
2) Head to the location (see map above) and you will see a big bird.
3) Protect this bird (The Matriarch) from waves of adds.
4) The Engulfer will come in the last wave.
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