Set Item Transmutation: Turning Duplicate Set Pieces into What You Need

What the service does

FG's official answer to set farming's biggest frustration: the same piece dropping again and again.

• ▸Set item transmutation is an extra Inventor service available only with Forgotten Gods installed.
• ▸It unlocks by completing the Act 7 side quest 'The Tome of Eanatum' - for that character on that difficulty, every campaign Inventor then offers the feature. Quest progress is tracked per character and difficulty, so other characters and difficulties must clear it again.
• ▸The exception is the Crucible DLC's Inventor, who offers transmutation regardless of quest progress as long as FG is installed.
• ▸What it does: re-forge a duplicate set item into another set item, complementing drop-luck-bound set collecting.
• ▸Transmuted items behave exactly like normally obtained set pieces - set completion bonuses trigger the same way.
• ▸For the Inventor's other services (component recovery, augment removal, and so on), see the components-and-augments article.

The two modes: same-set and cross-set

Two toggle-selected modes - both roll randomly, and neither lets you choose the result.

• ▸Same-set conversion: re-forges the input into a random different piece of the same set - ideal for chasing the one missing slot.
• ▸Cross-set conversion: re-forges the input into a random item from another set of comparable level - a way to recycle useless duplicates into a shot at other sets.
• ▸Cross-set conversion has separate cost tables for epic and legendary tiers, with legendary far more expensive.
• ▸Both modes roll fully at random - even same-set conversion can hand you a piece you already own.
• ▸The fewer pieces a set has, the better same-set odds get; large sets should be budgeted for multiple attempts.

Costs and limits

• ▸Costs combine fixed iron amounts with rare materials: 120,000 iron for same-set conversion, and 30,000 (epic) / 150,000 (legendary) for cross-set.
• ▸Materials span several types including Aether Crystals, and legendary cross-set conversion also demands a Celestial Lotus.
• ▸Sets with restricted acquisition - obtainable only from fixed sources - cannot be converted.
• ▸The iron costs bite, so this is not a spam-friendly service; legendary-tier attempts in particular deserve deliberation.
• ▸The Japanese wiki's Inventor page tabulates the full costs - check your materials before committing.

In practice: when to use it

• ▸1. The prime use is chasing a set's last one or two pieces - same-set conversion often beats continued farming.
• ▸2. Duplicate sets clogging the transfer stash become ammunition for cross-set conversion - just keep expectations modest against the randomness.
• ▸3. Before converting, confirm the set really is your build's final form - this site's build pages' gear sections help there.
• ▸4. Iron and rare materials compete with relic crafting and augment purchases - treat transmutation as one line in your endgame budget (see the endgame money article).
• ▸5. Excluded sets (restricted acquisition) leave you their intended route - farm the fixed source (see the legendary farming article).

1. Grim Dawn Japanese Wiki: Inventor — Confirms the FG requirement, unlocking via 'The Tome of Eanatum', the two modes, the costs (120,000 iron same-set; 30,000 epic / 150,000 legendary cross-set plus materials), random selection from comparable-level sets, and the restricted-set exclusion.
2. Official Grim Dawn Forum: Transmute Quest — Confirms the unlock quest as the Act 7 side quest The Tome of Eanatum (giver, location, unlock on completion); the same-set conversion mechanic itself is covered by the Inventor wiki page above.
3. Grim Dawn Japanese Wiki: FG — Confirms the per-character, per-difficulty quest-bound unlock and the Crucible Inventor offering transmutation regardless of quest progress.
4. Official Crate Forum: Grim Dawn v1.2.1.6 + Hotfix — Official patch notes for the verified version.