Spend Energy Shield before Mana for Skill Costs
Energy Shield protects Mana instead of Life 
What need have I for defence when my enemies are reduced to ash and splinters?
Energy Shield shown over mana, instead of life.
Eldritch Battery (often referred to as EB) is a keystone passive skill that makes energy shield protect mana instead of life.
Energy shield protects mana instead of life. All modifiers to energy shield apply normally but it is not affected by modifiers to mana or mana regeneration. Energy shield recharge and recovery through Zealot's Oath or Ghost Reaver function normally. Any reductions to mana (e.g. skill costs) will instead reduce energy shield by the same amount, and any reduction to energy shield will interrupt its recharging and reset its recharge delay.
With regards to skills like Blood Rage and Righteous Fire, Energy Shield is still counted in the degeneration applied to health.
Eldritch Battery also causes energy shields to no longer grant a chance to avoid stun.
Eldritch Battery is a standalone keystone located on the upper right edge of the skill tree.
- Fixed a bug where players with Eldritch Battery would spend energy shield to cast spells which reserved mana.
- Fixed a recently introduced bug where Eldritch Battery prevented the life degeneration of Righteous FireSpell, AoE, Fire
Cast Time: 1.00 secRequires Level 16Engulfs you in magical fire that rapidly burns you and nearby enemies. Your spell damage is substantially increased while under this effect. The effect ends when you have 1 life remaining.Per 1% Quality:
1% increased Spell DamageGrants (20-39)% more Spell Damage
Enemies Burn for 40% of your maximum Life per second as Fire Damage
You Burn for 90% of your maximum Life per second as Fire Damage
Enemies Burn for 40% of your maximum Energy Shield per second as Fire Damage
You Burn for 70% of your maximum Energy Shield per second as Fire Damage
+(0-5) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket..
- Eldritch Battery now causes Energy Shield to protect Mana instead of Life.
(Old effect: Converts all Energy Shield into Mana)
- Fixed a server crash related to the Discipline aura and Eldritch Battery.