You have issues with the Destiny 2 Quest Essence of Rage and cannot discover the Fangs of Shun’Gath?
No downside, we’ll help you.
Anchor of Light
Go deep down within the Temple of Crota to the World’s Grave space. Down there you can see the needed opponent, Shun’Gath, the Excised. Kill him and also you get the Fangs of Shun’Gath.