How to get Progenitor Essentia and what it is

What is Progenitor Essentia used for

Progenitor Essentia is legendary quality item used for crafting following:

Crafter´s Mark of the First Ones
Optional Reagents that sets the crafted gear ilvl to 262.
Costs proffesion items and one Progenitor Essentia.

Vestige of the Eternal
Legendary item to upgrade legendary gear by 3 ranks.
Costs profession materials and two Progenitor Essentia,

How to farm Progenitor Essentia

You get this by looting treasures in Zereth Mortis.

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