In PoE2, Spirit Reservation Efficiency on body armor is a desecrated affix on body armours , and recent community info says the practical way to target it is by repeatedly rerolling the item’s desecrated modifier pool until it lands on the reservation-efficiency suffix.

How it’s usually obtained

  • It appears as a suffix on body armor, tied to desecrated mods.
  • The commonly described method is to keep rerolling the body armor’s desecrated affix until you hit it, often with Abyssal Echoes / Omen -style rerolling mechanics mentioned by players.
  • Because it is a targeted hunt, players often start from a strong base first, especially one with a good Spirit-related or high-Energy-Shield foundation.

What players are aiming for

A good endgame version usually combines:

  • High Energy Shield.
  • Flat Spirit or other Spirit support.
  • Spirit Reservation Efficiency as the key suffix.

That is why many minion or Spirit-heavy builds treat the chest as a major power slot rather than just a defense piece.

Practical route

  1. Get the right body armor base.
  2. Make sure the item can roll the desecrated suffix pool you want.
  3. Reroll the desecrated modifier until Spirit Reservation Efficiency appears.
  4. Keep the rest of the item’s defenses strong enough for your build.

Important note

This is not generally a cheap or casual craft. The discussion I found suggests it can be expensive, especially if you are chasing a highly specific setup with a fractured or premium base.

If you want, I can turn this into a step-by-step crafting path for a budget, midrange, or mirror-tier version.