Crafting Items: Rules and Procedures

Crafting magic items in Dungeons & Dragons sits at one of the game's most satisfying intersections: the creative and the mechanical. The rules govern how player characters spend downtime, gold, and spell slots to produce equipment outside the normal treasure economy. Getting those rules right matters because a misread crafting procedure can either break an economy or discourage players from engaging with one of the most flavorful systems the game offers.

Definition and scope

Item crafting is a downtime activity — a structured use of time between adventures, formalized in the Dungeon Master's Guide (5th Edition, Chapter 6) and expanded in Xanathar's Guide to Everything (pages 128–129). At its core, crafting lets a character produce a weapon, piece of armor, or magic item by meeting three requirements: the appropriate proficiency, access to a formula or spell, and enough raw materials measured in gold piece value.

The scope is broader than it first appears. Crafting covers mundane items — a set of plate armor, a longbow — as well as magic items ranging from common trinkets to legendary artifacts. The key dimensions and scopes of D&D that shape this system include the rarity tier of the target item, the caster level of the character attempting the work, and whether the Dungeon Master requires a formula as a prerequisite.

One important distinction: crafting is not the same as scribing spell scrolls or brewing potions, though those activities borrow from the same downtime framework. Each has its own cost table and time requirement.

How it works

The basic crafting procedure from the Dungeon Master's Guide runs as follows:

1. Identify the item's rarity. Common, uncommon, rare, very rare, and legendary items each carry a minimum character level requirement and a base gold cost: common (100 gp), uncommon (500 gp), rare (5,000 gp), very rare (50,000 gp), and legendary (500,000 gp).
2. Confirm proficiency. The crafter must be proficient with the relevant tools — smith's tools for metal armor, leatherworker's tools for studded leather, and so on.
3. Acquire a formula. Xanathar's Guide to Everything (p. 128) treats the formula as a separate magic item — essentially a blueprint — which must be found, purchased, or researched before work begins.
4. Spend downtime days. A character can produce 25 gp worth of progress per downtime day. A 500 gp uncommon item therefore requires 20 downtime days of uninterrupted work.
5. Check spellcasting prerequisites. If the item requires a spell — a cloak of elvenkind requires pass without trace — either the crafter or a collaborating spellcaster must be able to cast it.

Multiple characters can collaborate on a single item, each contributing 25 gp worth of progress per day, which can dramatically compress the timeline for expensive legendary items. The Dungeon Master's Guide permits this cooperative approach explicitly, though the Dungeon Master adjudicates whether a given combination of crafters makes logical sense.

Understanding how it works at the table-level often means negotiating between the published cost tables and what actually serves the campaign's pacing and economy.

Common scenarios

Mundane gear between sessions. A fighter with smith's tools proficiency wants a backup suit of half plate (750 gp). At 25 gp per day, that's 30 downtime days — roughly equivalent to a month of in-world time. Most DMs find this a reasonable cost for player-driven gear acquisition.

Potions of healing. Xanathar's Guide sets the crafting cost at 25 gp and the time at 1 downtime day per potion — which makes a herbalism kit and the healer's feat one of the more mechanically efficient crafting setups available at low levels.

Scrolls. Scribing a spell scroll requires the spell to be in the character's spell list, the appropriate spell slot, and costs ranging from 15 gp for a cantrip to 50,000 gp for a 9th-level spell (Xanathar's Guide, p. 133). A wizard scribing fireball scrolls as a side business is genuinely plausible math at mid-levels.

Collaborative legendary item. A party of 4 crafters each contributing 25 gp per day can produce 100 gp of progress daily on a 500,000 gp legendary item. That still requires 5,000 downtime days — roughly 13 in-world years — which is probably why legendary crafting is treated as a campaign-defining event rather than a weekend project.

The D&D frequently asked questions page addresses several of the common edge cases that come up around spell prerequisites and collaborative crafting.

Decision boundaries

The Dungeon Master holds significant discretion here, and the rules acknowledge it openly. Three specific judgment calls recur most often:

Formula availability. The DMG doesn't specify where formulas are found or what they cost to purchase. A DM who treats every formula as a dungeon reward creates a scarcity-driven system. One who sells them freely at 10% of the item's base cost creates a gold-sink economy. Neither is wrong — they just produce different campaign textures.

Requiring the formula vs. requiring the spell. The DMG and Xanathar's are not perfectly aligned. The DMG (p. 129) lists spell prerequisites without mandating a separate formula document; Xanathar's introduces the formula as a distinct object. Tables using both books need to choose which rule takes precedence, and the answer should be stated explicitly before a player invests 20 downtime days.

Interruption. If crafting is interrupted — the party leaves town, combat intervenes — the DMG allows progress to be banked and resumed. Some DMs rule that an interruption of more than a set number of days spoils alchemical or enchantment work. That's a house rule, not a default, and players deserve to know it before they start.

Getting clarity on these boundaries early prevents the specific frustration of a player who spent real session time planning a crafting project only to discover the rules mean something different at this particular table. The full D&D rules overview is a useful reference for orienting new players to where crafting fits within the broader game structure, and getting help for D&D questions covers where to take disagreements that the rulebooks don't cleanly resolve.