Aura

Auras are permanent buff effects that benefit your character and extend their benefits to nearby party members and minions. Regular auras (applied by skills) reserve a percentage of the player's mana pool, with the exception of Clarity, which reserves a flat amount.

All allies within range of a player's aura skill will receive the aura's buff. Passive and item mod bonuses can apply to the stats granted by auras, but these bonuses are determined by the passives and items of the receiver, not the player who is the source of the aura. For example, player A has passives for extra energy shield and is generating a Discipline aura. Player A will gain a bonus on the energy shield granted by the aura. But party member Player B who is standing inside the aura radius of Player A will only receive the base amount of energy shield granted by the aura unless Player B also has energy shield boosting passives.

Skills

Most auras originate from skills. These can either be regular aura skills or curse auras.

Regular aura skills

Regular auras come from aura skill gems and grant the player bonus stats. There are currently 13 aura skills that grant a permanent effect:

Skill	Description	Mana Reserve	Level
Anger	Casts an aura that adds flat Fire damage to attacks and spells.	50%	24
Clarity	Casts an aura that grants Mana Regeneration.	34-279	10
Determination	Casts an aura that enhances Armor by a percentage.	50%	24
Discipline	Casts an aura that grants Energy Shield.	35%	24
Grace	Casts an aura that grants Evasion Rating.	50%	24
Haste	Casts an aura that increases Attack Speed, Cast Speed and Movement Speed.	50%	24
Hatred	Casts an aura that adds Cold damage, by a percentage of your physical damage, to any physical damage skill including spells.	50%	24
Purity of Elements	Casts an aura that grants a bonus to all Elemental Resistances.	35%	24
Purity of Fire	Casts an aura that grants a bonus to Fire Resistance and Maximum Fire Resistance.	35%	24
Purity of Ice	Casts an aura that grants a bonus to Cold Resistance and Maximum Cold Resistance.	35%	24
Purity of Lightning	Casts an aura that grants a bonus to Lightning Resistance and Maximum Lightning Resistance.	35%	24
Vitality	Casts an aura that grants life regeneration based on a percentage of maximum life.	35%	24
Wrath	Casts an aura that adds flat Lightning damage to attacks and a percentage increased Lightning damage to spells.	50%	24

And there are five vaal auras that grant a temporary effect:

Skill	Description	Duration	Level	Souls
Gluttony of Elements	Casts a temporary aura that causes taking elemental damage to heal you and nearby allies instead.	6.00 seconds	N/A	36, 54, 72
Vaal Clarity	Casts a temporary aura that lets you and your allies cast skills without paying their mana costs.	8.00 seconds	10	16, 24, 32
Vaal Discipline	Casts a temporary aura that grants energy shield to you and your allies and prevents energy shield recharge being delayed by damage taken.	3.00 seconds	31	24, 36, 48
Vaal Grace	Casts a temporary aura that grants you and your allies the ability to dodge attacks and spells.	6.00 seconds	31	24, 36, 48
Vaal Haste	Casts a temporary aura that increases the movement speed, attack speed and cast speed of you and your allies.	6.00 seconds	31	24, 36, 48

Curse auras

With the use of the Module Error: No skills found with q_where = skill.active_skill_name="Blasphemy" support gem, any curse gem may be converted into an aura. Curse auras are affected by both curse and aura radius increases. Most aura effect increases specify that they only apply to non-curse auras. They will have no effect on curse auras.

Curses applied via Blasphemy count towards the active curse limit.

Support Gem Combinations

Auras themselves do not do damage. They provide a buff which can add extra damage, extra defenses or utility. As with curses, added damage supports can't be linked with auras successfully. These support gems will affect auras:

Module Error: No skills found with q_where = skill.active_skill_name="Blasphemy" - Turns supported curses into an aura.
Module Error: No skills found with q_where = skill.active_skill_name="Blood Magic" - This will cause linked auras to reserve health instead of mana.
Module Error: No skills found with q_where = skill.active_skill_name="Spell Totem" - Casts a totem which will maintain the aura. The cost to cast the totem is the mana that would be reserved multiplied by the Mana Cost Multiplier of the Totem support and any other linked support gems.
Module Error: No skills found with q_where = skill.active_skill_name="Generosity" - Increases the effect of the non-curse auras on allies (including minions) but prevents them from affecting the player.
Module Error: No skills found with q_where = skill.active_skill_name="Enlighten" - Reduces the mana reserved by the aura.
Module Error: No skills found with q_where = skill.active_skill_name="Empower" - Adds levels to supported auras.
Note! Module Error: No skills found with q_where = skill.active_skill_name="Reduced Mana" - does not affect mana/health reservation.

Passive skills

There are passive skills that grant aura bonuses.

Area of effect radius for auras

These passive skills grant increased area of effect radius for auras.

Template:Passive table

Effectiveness of auras

These passive skills grant increased effect magnitude for auras.

Template:Passive table

Unique Items

The following unique items related to Auras: Lua error in Module:Item_table at line 1971: bad argument #2 to 'format' (string expected, got nil).

Calculation Mechanics

The calculation to determine the reservation cost of an aura is ceiling(ceiling(floor(base Mana Reserved * Mana Multiplier) * (100% - less Mana Reserved)) * (100% - reduced Mana Reserved)).
With equipment and passives available as of version 1.3, each category includes the following.

Mana Multiplier: Support Gem.
Less Mana Reserved: Mortal Conviction.
Reduced Mana Reserved: All passive nodes which provide "reduced Mana Reserved", Alpha's HowlAlpha's Howl
Sinner TricorneEvasion: (664-850)Requires Level 64, 138 Dex+2 to Level of Socketed Aura Gems
(80-100)% increased Evasion Rating
+(20-30)% to Cold Resistance
25% chance to Avoid being Chilled
Cannot be Frozen
16% increased Mana Reservation Efficiency of SkillsNature respects the strong
And paints the snow red
With the blood of the weak, Prism GuardianPrism Guardian
Archon Kite ShieldChance to Block: 22%
Armour: (156-179)
Energy Shield: (32-37)
Movement Speed: -3%Requires Level 68, 85 Str, 85 Int+12% to all Elemental Resistances+2 to Level of Socketed Aura Gems
Socketed Gems Cost and Reserve Life instead of Mana
Socketed Gems have 30% increased Reservation Efficiency
+(20-30) to Dexterity
+25% to all Elemental ResistancesWhen blood is paid, the weak think twice., and SkyforthSkyforth
Sorcerer BootsEnergy Shield: (51-59)Requires Level 67, 123 Int+(60-120) to maximum Mana
30% increased Movement Speed
25% chance to gain a Power Charge on Critical Strike
12% increased Reservation Efficiency of Skills
You have no Life Regeneration
Stun Threshold is based on 500% of your Mana instead of LifeThe quick die young, the brilliant go mad,
and the powerful stand alone in a wasteland of their own creation..

Examples of this calculation are as follows.

4% reduced Mana Reserved, and Discipline:
ceiling(floor(50%)*(100%-4%)) = ceiling(floor(50%)*96%) = ceiling(49%*96%) = ceiling(48%) = 48%

Mortal Conviction, 6% reduced Mana Reserved, Prism GuardianPrism Guardian
Archon Kite ShieldChance to Block: 22%
Armour: (156-179)
Energy Shield: (32-37)
Movement Speed: -3%Requires Level 68, 85 Str, 85 Int+12% to all Elemental Resistances+2 to Level of Socketed Aura Gems
Socketed Gems Cost and Reserve Life instead of Mana
Socketed Gems have 30% increased Reservation Efficiency
+(20-30) to Dexterity
+25% to all Elemental ResistancesWhen blood is paid, the weak think twice., and Discipline:
ceiling(ceiling(floor(50%)*(100%-50%))*(100%-(6%+25%))) = ceiling(ceiling(floor(50%)*50%)*69%) = ceiling(ceiling(50%*50%)*69%) = ceiling(ceiling(25%)*69%) = ceiling(25%*69%) = ceiling(17.25%) = 18%

Or, in the most extreme case, Mortal Conviction, 38% reduced Mana Reserved, Alpha's HowlAlpha's Howl
Sinner TricorneEvasion: (664-850)Requires Level 64, 138 Dex+2 to Level of Socketed Aura Gems
(80-100)% increased Evasion Rating
+(20-30)% to Cold Resistance
25% chance to Avoid being Chilled
Cannot be Frozen
16% increased Mana Reservation Efficiency of SkillsNature respects the strong
And paints the snow red
With the blood of the weak, Prism GuardianPrism Guardian
Archon Kite ShieldChance to Block: 22%
Armour: (156-179)
Energy Shield: (32-37)
Movement Speed: -3%Requires Level 68, 85 Str, 85 Int+12% to all Elemental Resistances+2 to Level of Socketed Aura Gems
Socketed Gems Cost and Reserve Life instead of Mana
Socketed Gems have 30% increased Reservation Efficiency
+(20-30) to Dexterity
+25% to all Elemental ResistancesWhen blood is paid, the weak think twice., and Discipline:
ceiling(ceiling(floor(50%*70%)*(100%-50%))*(100%-(38%+8%+25%))) = ceiling(ceiling(floor(35%)*50%)*29%) = ceiling(ceiling(35%*50%)*29%) = ceiling(ceiling(17.5%)*29%) = ceiling(18%*29%) = ceiling(5.22%) = 6%

Version history

Version	Changes
1.1.4	Added a new corrupted Skill Gem - Vaal Grace: Casts a temporary aura that grants you and your allies the ability to dodge attacks and spells. Added a new corrupted Skill Gem - Vaal Clarity: Casts a temporary aura that lets you and your allies cast skills without paying their mana costs.
1.1.3	Added a new corrupted Skill Gem - Vaal Haste: Casts a temporary aura that increases the movement speed, attack speed and cast speed of you and your allies. Added a new corrupted Skill Gem - Vaal Discipline: Casts a temporary aura that grants energy shield to you and your allies and prevents energy shield recharge being delayed by damage taken.
1.0.1	Added a new Strength skill gem - Purity of Fire: Casts an aura that grants fire resistance to you and your allies. Higher levels increase maximum fire resistance. Added a new Dexterity skill gem - Purity of Ice: Casts an aura that grants cold resistance to you and your allies. Higher levels increase maximum cold resistance. Added a new Intelligence skill gem - Purity of Lightning: Casts an aura that grants lightning resistance to you and your allies. Higher levels increase maximum lightning resistance. Purity renamed to Purity of Elements. This aura no longer grants maximum resistances.
1.0.0	For all Auras: Base area of effect has been increased. The area of effect bonus from quality has been doubled. The mana cost for all auras except Clarity has been changed to 60% reservation.
0.9.8	Added a new player aura - Clarity: An aura that grants mana regeneration to you and your allies.
0.9.7	Added nine player aura skills: Anger (Fire Damage), Hatred (Cold Damage), Wrath (Lightning Damage), Discipline (Energy Shield), Grace (Evasion), Determination (Armour), Purity (Elemental Resistances), Haste (Attack Speed and Cast Speed) and Vitality (Life Regeneration).