Cluster craft

Where the numbers come from

• Mod weights come from the game’s data files, read through RePoE. They set how likely each notable is to roll.
• Sell prices come from the official trade site. For each combo PoeStash reads the 10 cheapest listings that are not corrupted or unique, then takes the cheapest one within 50% of their median. That skips price fixers who list far too low. The scan covers every combo about once a day, so a row can be a day old and says when it was checked.
• Currency prices (Alteration, Augmentation, Regal, Exalted, Scouring and Transmutation) come from poe.ninja and refresh about every 30 minutes.

Medium jewels, 2 notables

Every medium notable is a prefix, and a magic item holds one prefix and one suffix. The craft runs like this.

1. Alteration spam until either target notable rolls. The expected number of Alterations is the whole prefix weight over the two targets’ weights.
2. Augment fills the other slot. It can never be a notable on a medium jewel, since they are all prefixes.
3. Regal makes the item rare and adds one mod. That mod can be the other target.
4. If the Regal misses, Scour the item, Transmute it back to magic and start again.

chance an Alteration hits either = (weight A + weight B) / total prefix weight
chance the Regal finishes = average of (B after A) and (A after B)
cost per cycle = Transmute + (expected Alterations x Alteration price) + Augment + Regal + Scour
total cost = base + cost per cycle / chance the Regal finishes − Scour

Large jewels, 3 notables

Large jewels have prefix and suffix notables. After the Regal the item has three mods, and an Exalt adds a fourth.

1. Alteration spam until any of the 3 target notables rolls.
2. Augment adds one mod.
3. Regal makes the item rare and adds one mod. If it is another target, carry on. If not, Scour, Transmute and start again.
4. Exalt adds a fourth mod. If it is the last target, the craft is done. If not, Scour, Transmute and start again.

chance an Alteration hits any target = (weight A + weight B + weight C) / total pool weight
chance of success after target X = the better of (Regal Y then Exalt Z) and (Regal Z then Exalt Y)
chance of success per cycle = sum over X of (chance X rolls first x chance of success after X)
expected attempts = 1 / chance of success per cycle

Mod pool and weights

The pool of an enchantment holds its notables and also the small passives that only add stats, like life or damage. When you spam Alterations, a target notable competes with the whole pool and not just the other notables. The odds shown already count the full pool.

Item level

Each notable needs a minimum item level. PoeStash finds the lowest item level that can roll every target, then checks each valid breakpoint above it. A lower item level trims the pool, which improves the odds, but those bases can cost more because other crafters want them too. The cheapest total (base plus crafting) is marked best value and the highest odds are marked best odds. One base can be both.

A range like 68 to 74 means every base in it has the same mod pool. A range like 75+ means that level or higher works. Buy base searches the whole range. Medium jewels come on bases with 4 or 5 passives, large ones with 8.

Listings and confidence

High, 50 or more listingsMedium, 10 to 49Low, 1 to 9

Low means few players trade this combo. The sell price may be off, since one overpriced listing can skew it.

Limits

• The sell price is a listing price, not a price something sold for.
• Trading fees are not counted.
• The time spent listing and selling is not counted.