Item:Major Essence of Resistance
The tier 7 (minimum level 100) version of this essence is a selectable reward for the quest  Vol. IV, Book 3: Chapter 4: Another Difficult Road.
This item is available with different minimum levels. The maximum tier of this essence is 7.
This page has been verified as correct by Gaerlin for update 21.3.3 on Mon, 5 Feb 2018