Metacrafting: Locking Prefixes and Suffixes in Path of Exile

Metacrafting is how top-end items get finished. Instead of rerolling the whole item and hoping, you protect the mods you already like and only change the ones you don't. The tools are a handful of special crafting bench options called metamods.

Check the base before locking a side

A prefix/suffix lock protects eligible progress; it does not unlock higher tiers or change the base. Before investing Divines in locks, check the entire finished target and retained item level. Boots chasing natural 35% movement speed need 86; eligible suppression gloves commonly need 85. Use the base guide, not the minimum level for your first anchor alone.

This wand discussion shows why the starting route matters: a fractured suffix can anchor the craft, but comments correctly warn that a fractured wand cannot use the magic-item imprint method. Choose the fracture or imprint route before rolling, then check the operation against the metamod interaction table. A lock is not universal protection from every currency.

The metamods

• Prefixes Cannot Be Changed protects existing prefixes for compatible operations. The lock is itself a suffix.
• Suffixes Cannot Be Changed protects existing suffixes for compatible operations. The lock is itself a prefix.
• Cannot Roll Attack/Caster Modifiers blocks tagged additions only where the crafting method respects that metamod.
• Can have up to 3 Crafted Modifiers counts itself, leaving room for two additional bench-crafted mods.

A lock is not universal protection. Essences and fossils cannot be used on an item with these metamods, and an Awakener's Orb does not preserve affixes just because a lock was crafted. Check the specific operation in Craft of Exile's interaction table and verify the in-game recipe. That table also warns that interactions can change without patch-note coverage.

Locks protect existing mods; they do not necessarily prevent adding into an open slot on the protected side. A compatible reroll or Scour can consume the lock on the unprotected side, so reapply it before the next risky step.

The classic sequences

Keep the prefixes, redo the suffixes (lock + Scour).

1. The item has great prefixes and weak suffixes, with at least one open suffix slot.
2. Bench-craft Prefixes Cannot Be Changed.
3. Use an Orb of Scouring. It removes every suffix, including the lock craft, and the prefixes survive.
4. Refill the suffixes with Exalts, bench crafts or more metacrafting.

Remove one bad mod (lock + Annul).

1. Lock the half you want to keep.
2. Use an Orb of Annulment. It can only remove a mod from the open side. Since the lock itself sits on that side, it's one of the mods the Annulment can hit.
3. Add back what you want, with an Exalt (after blocking bad pools with Cannot Roll Attack or Caster mods) or a bench craft.

The same patterns mirrored fix prefixes while protecting suffixes.

Cheaper alternatives worth knowing

When Wild Bristle Matron guarantees the suffix lock

Wild Bristle Matron adds a crafted metamod. Suffixes Cannot Be Changed is the only prefix among those metamods, so it is forced when no suffix metamod can fit:

1. Have an eligible non-unique item with all suffix slots occupied and an open prefix: three suffixes on an ordinary rare, or one on a magic item.
2. Check existing crafted mods. A normal existing bench craft prevents adding another; do not fill a suffix with a temporary craft and assume the beast ignores the craft limit.
3. Use the beast recipe and inspect the result before the next operation. A compatible reforge or Scour can consume this lock just like the bench version.

With an open suffix, another metamod can be selected: Matron is not a universal way to choose the suffix lock. Compare the current beast and supporting-beast cost with the bench fee. For a magic Tailwind-only base, its single occupied suffix makes this useful before an imprint.

Other ways to preserve progress

• Imprints. Before an item goes rare, an imprint of the magic item (from a Craicic Croaker in the Bestiary) lets you retry the risky steps that follow, like a Regal or an Orb of Dominance, instead of locking anything. See the imprints guide.
• Eldritch dominance. On non-influenced armour with Eldritch implicits, the Eldritch Chaos, Exalted and Annulment Orbs only touch prefixes or suffixes depending on which implicit is dominant. That's a built-in half-lock with no bench cost. See the Eldritch guide.
• 3.29's bench rerolls. New bench options reroll three random modifiers (3 Chaos) or one random modifier (8 Chaos). You cannot choose which mods change, and a good affix can be lost. These cost more per use than a single Chaos Orb. Details in the 3.29 crafting changes post.

Why it's worth the price

Metacrafting lets you iterate on a near-perfect item instead of starting over, when the chosen operation respects the lock. Compare that finishing cost with rerolling or buying the completed item. Expensive locks usually make sense near the end, after valuable affixes are already in place.

Where the grind (and automation) actually is

Metacrafting is the finishing stage. The time-consuming part comes before it: rolling a base until it has "great prefixes, weak suffixes" in the first place. That run-up (alteration, chaos or fossil rolling until the item is close) is what Exiled Bench automates. It gets you to a metacraft-ready base hands-free, and you do the precise bench work yourself.

With From my stash, the app can run Alt + Aug → Regal → Exalt or Chaos → Exalt. Bonus mod seeks a different Step-2 target; Add Exalts adds up to the cap regardless of what lands. The setup guide explains both.

Optional Annuls are disabled at 0 by default. They can remove the anchor; they do not safely isolate a bad mod. Leave them off for this setup. Apply bench metamods separately, check the operation honours them, and keep valuable finished sides out of generic Scour/restart recipes.

For those rolling methods, see chaos spam vs alt-regal-exalt and the beginner currency guide.

Tips

• Metacraft last. Only lock and iterate once the item is genuinely worth the currency.
• Plan the open side. Know exactly which mod you're adding or removing before you apply the lock.
• Block before you Exalt. Cannot Roll Attack/Caster Modifiers can make an Exalt far more likely to land something useful.

Sources

• Craft of Exile: metamod interactions (check before spending)
• PoEDB: Crafting Bench
• GGG: 3.28 patch notes
• GGG: 3.29 patch notes