Reservation

Reservation is a method of using a resource, typically mana or life, to pay for auras, herald skills, buffs, mine skills, or any skill with an ongoing effect. Some items may also reserve resources. Rather than paying the cost once as with normal skills, a portion of the resource is set aside as unusable for as long as the skill is active. Reserving a resource does not affect its maximum, so percentage modifiers such as Regenerate 1% of Maximum Life are unaffected when you reserve life, for example.

Reserved resource values from Skills are multiplied by support gem cost & reservation multipliers as usual. The Blood Magic Keystone and Arrogance Support will cause skills that usually reserve Mana to reserve Life instead.

Reducing reservation

Reservation Efficiency (RE) is a modifier that can modify the reservation of one or several Skill reservations. The total of all "Increased Reservation Efficiency" modifiers whether from passives, jewels, or items, is summed before being applied. It uses the following formula:

   Mana Reserve = Base Reserve % / (100% + Total Reserve Efficiency %)

Example Reservations

Reservation multipliers such as that granted by Enlighten Support are multiplicative with reductions from Reservation Efficiency. The amount reserved will NOT be reduced by the property "#% reduced Cost" such as from the Inspiration Support gem. Flat Cost reduction such as Elreon's mod will not reduce reservation either.

Enchantments

Helmet enchantments now grant 20% Mana RE (Merciless) or 30% Mana RE (Eternal) for 50% base reservations skills; 30/45% MRE for 35% base reservation skills, and 50/75% MRE for 25% or flat base reservation skills.

Enchantments for skills that have 35% base reservation now grant 30/45% increased mana reservation efficiency. Enchantments for skills that have 25% or flat base reservation now grant 50/75% increased mana reservation efficiency.

Jewels

A Jewel (either classic jewel, Abyss jewel , cluster jewel or Timeless Jewel) corrupted by a Vaal Orb or Altar of Corruption can get 2% increased Reservation Efficency as an implicit modifier.

Aura Cluster Jewel Notables grant 50% Mana RE for skills that have 50% base reservation and 80% Mana RE for skills that have 35% base Reservation, and 100% Mana RE for skills that have 10% base Reservation. Small passive nodes on Aura Cluster Jewels grant 6% Mana RE, which can scale up to 8% each with the Added Small Passive Skills have 35% increased Effect.

Items

Essence of Loathing can be used to guarantee a #% increased Mana Reservation Efficiency of Skills modifier (value depends of the tier of the essence) on Body Armour and Helmets.

Various modifiers to Reservation Efficiency can be found on Influenced Shields, Helmets, and Amulet. It can also be found on items from reward chests found in Delve nodes that grant Minion or Aura items; various Unique items; and as a Synthesized implicit.

Passive skills

The passive skills with "increased Reservation Efficiency" are all part of Reservation Mastery themed clusters.

There is a total of 28% Mana RE in the Sovereignty cluster in the outer Templar area, 24% Mana RE in the Charismacluster between Ranger and Shadow, and 8% Mana RE each in the Leadership and Influence clusters in the Shadow and Scion areas. The Champion of the Cause cluster also contains 16% RE which is generic, applying to Life Reservation as well. Reservation Mastery clusters also provide an option of 15% Mana RE or 30% Life RE.

There are also passives that grant RE for Curse Aura Skills, Heralds, and skills that throw mines. In addition, several Mastery clusters grant RE for a specific aura.

The Mortal Conviction keystone allows you to reserve one non-Banner aura for free, but prevents you from having more than one aura active.