Endurance, Frenzy and Power Charges

Certain Skill Gems grant you an Endurance, Frenzy or Power Charge. All players start with a maximum of two of each charge. Certain notable keystones increase this maximum. When you gain one of these charges, they rotate around you, glowing red, green or blue respectively. They last until the end of a battle, or until they are consumed. Consuming any number of charges is a minor action,

Endurance Charges double your and  until the end of your next turn when consumed. They grant 4 Armour and Resistance per endurance charge.

Frenzy Charges when consumed lets your next attack roll be Lucky. Frenzy Charges grant 4 damage per frenzy charge.

Power Charges can be consumed when you attack, and increase the bonus damage of critical strikes by 10 per tier and your critical range by 1. Power Charges regenerate 1 at the start of your turn per power charge.