Path of Exile Socket Crafting Glossary

July 2, 2026

Use this glossary alongside the Vorici Calculator when a term from a build guide or crafting discussion isn’t clear.

Bench Craft

A guaranteed crafting option available at Vorici’s crafting bench (unlocked via master missions) that forces a specific number of sockets to a chosen color for a fixed Chromatic Orb cost, rather than relying on random rolling. Available tiers guarantee 1, 2, or 3 sockets of a chosen color.

Chromatic Orb

A currency item used to re-roll the colors of all sockets on an item simultaneously. Each socket’s resulting color depends on the item’s attribute requirements — the orb itself doesn’t target specific colors, it re-rolls the whole item’s sockets at once based on probability.

Expected Cost

The average number of Chromatic Orbs needed across many random-roll attempts to hit a target configuration, calculated as 1 divided by the probability of success on a single roll. Because outcomes follow a geometric distribution, actual results vary widely around this average — see percentile below.

Multinomial Probability

The statistical formula used to calculate the chance of a specific combination of socket colors appearing simultaneously across multiple sockets, accounting for all the different orderings that produce the same color count. Used to compute the probability of a full target configuration (e.g., exactly 2 Red, 1 Green, 3 Blue) on a chromatic roll. See the chromatic orb probability formula for the full derivation.

Off-Color Socket

A socket color that doesn’t match an item’s dominant attribute requirement — for example, a Blue socket on a high-Strength item. Off-color sockets have lower per-roll probability and are more expensive to obtain through random rolling, often making the Vorici bench the more efficient method.

On-Color Socket

A socket color that matches (or is favored by) an item’s attribute requirements — for example, a Red socket on a high-Strength item. On-color sockets have high per-roll probability and are typically cheap to obtain through random chromatic rolling.

Percentile (90th / 99th)

A measure of how much currency is needed to succeed at a given confidence level, accounting for the variance inherent in random rolling. The 90th percentile is the cost at which 90% of attempts will have already succeeded; the 99th percentile covers all but the unluckiest 1% of outcomes. Used for budgeting beyond just the average expected cost.

Vorici

A crafting NPC (master) in Path of Exile whose crafting bench provides guaranteed socket-coloring options. Unlocking Vorici’s bench recipes is one of the most valuable early-league crafting investments for any build needing off-color sockets.

For the full math behind these terms, see the chromatic orb probability formula. To calculate your own item’s socket costs, use the Vorici Calculator. For these terms applied to an actual craft, see how to get off-color sockets cheaply.