Reservation

Reserved mana is shown grey on the mana orb.

Mana reservation is an alternative method of using mana to pay for skills which is usually found on skills with an ongoing effect, such as auras and heralds. Rather than paying the mana cost once as with normal skills, a portion of mana is set aside as unusable for as long as the skill is active. Having mana reserved does not reduce the rate of mana regeneration, so it will reduce the time taken for mana to regenerate to its (temporary) maximum.

Reserved mana values are multiplied by support gem mana cost multipliers as usual. The Blood Magic passive will cause life to be reserved instead of mana.

Skills which reserve mana

Mana can be reserved in two ways:

• By a fixed amount, which grows as the gem levels
• By a percentage of maximum mana, which does not change with gem level

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Reducing mana reservation

The amount reserved can be reduced by passives or items with the "Reduced Mana Reserved" or "Less Mana Reserved" properties. The amount reserved will NOT be reduced by the property "Reduced Skill Cost" such as from the support gem. Elreon's items will not reduce reservation costs either.

The total of all "Reduced Mana Reserved" modifiers whether from passives, jewels, or items, is summed before being applied. However "less" modifiers, and mana multipliers such as that granted by each apply as separate multiplications.

Passive skills

The passive skills with "reduced" reservation are all part of aura themed clusters.

There is a total of 14% reduction in the cluster in the outer Templar area, 12% in the cluster between Ranger and Shadow, and 4% each in the clusters in the Shadow, outer Duelist, and outer Scion areas. There is a single "Less" passive, Mortal Conviction, which lies behind Blood Magic so will be reducing Life reserved, not Mana.

Passives which reduce mana reserved: Template:Passive table

Unique items

These unique items provide reduced or increased reservation: #invoke: Item table

Reservation calculations

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 2.3, each category includes the following.

• Mana Multiplier: and corrupting a Body Armour with a Vaal Orb can give the item "Skill Gems in this item get a 95% Mana Multiplier" as an implicit.
• Less Mana Reserved: Mortal Conviction.
• Reduced Mana Reserved: All passive nodes which provide "reduced Mana Reserved", Conqueror's EfficiencyConqueror's Efficiency
  Crimson JewelLimited to: 13% reduced Mana Cost of Skills
  4% increased Skill Effect Duration
  4% increased Mana Reservation Efficiency of SkillsThe stone may yet bleed.Place into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket., 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 Hatred:
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 Hatred:
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, Conqueror's EfficiencyConqueror's Efficiency
Crimson JewelLimited to: 13% reduced Mana Cost of Skills
4% increased Skill Effect Duration
4% increased Mana Reservation Efficiency of SkillsThe stone may yet bleed.Place into an allocated Jewel Socket on the Passive Skill Tree. Right click to remove from the Socket., 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, 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., 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. with +1 to Level of Gems in this item corrupted implicit, level 4 , and Hatred:
ceiling(ceiling(floor(50%*84%)*(100%-50%))*(100%-(38%+8%+8%+25%))) = ceiling(ceiling(floor(42%)*50%)*21%) = ceiling(ceiling(42%*50%)*21%) = ceiling(ceiling(21%)*21%) = ceiling(21%*21%) = ceiling(4.41%) = 5%

External links

• Mikelat's Path of Exile Aura Calculator