Considering helping out on the wiki to keep it updated - in particular the changed unique items need to be updated to reflect 2.6.0 changes.
Mods and base items have been updated to 2.6 values - skill progressions on some skill gem pages may need updating or some bugs need to be fixed.
Unrelenting is a notable Ascendancy passive skill for the Juggernaut that grants increased damage per endurance charge and a reduction to elemental damage while at maximum endurance charges. It also causes all endurance charge to have a chance to gains to grant you up to your maximum endurance charges if you have less instead. (e.g. If you have 2/7 endurance charges and gain an endurance charge, there is a chance you gain 5 charges instead, setting your endurance charges at maximum.)