They are associated with strength and represent a temporary increase to the ability to endure pain during combat. By default, you can have up to 3 Endurance Charges floating around you. The closest you get to endurance charges is a mob in act 2 called Oak's Devoted. It curses enemies with warlord's mark which can in turn generate endurance charges. 15% chance that if you would gain Endurance Charges, you instead gain up to your maximum number of Endurance Charges Gain 1 Endurance Charge every second if you've been Hit Recently 1% increased Attack and Cast Speed per Endurance Charge 6% increased Critical Strike Chance per Endurance Charge +4% to all Elemental Resistances per Endurance Charge 4% additional Physical Damage Reduction per Endurance Charge Endurance charges are one of the three charge types. You can increase this number by three passive skill tree nodes, as well as some unique items.