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Carpentry Mastery

One of the four crafting masteries. They share an identical perk structure and a single shared proc outcome roll — see also Blacksmithy, Tailoring and Bowcraft & Fletching. Like the gathering masteries they level from working, not from kills: every successful craft earns XP. See Skill Masteries for the system itself.
Requires Carpentry at 90.0
Taught by Carpenter — 10,000 gold
Ultimate Woodwright's Fortune

Perks

Perk Effect per level At level 8
True Joinery True Joinery +2.5% exceptional chance on every carpentry craft +20%
Runic Grain Runic Grain +2.25 points on every magic attribute roll of the weapons, shields and instruments you build +18 points
Banecarved Banecarved (template) 0.4% chance that an exceptional staff, club, shield or armor piece made from colored wood comes out a Slayer 3.2%

The perks only help the craft they belong to — a slotted Carpentry mastery does nothing for your fletching, and vice versa.

True Joinery applies to everything the saw makes, furniture and deeds included — though only wooden weapons, shields and instruments carry magic rolls for the other two perks to act on. It stacks with the colored-saw and town bonuses.

Runic Grain is the only way besides Magical Essence to push the magic rolls past what wood, saw and luck give — at level 8 it is worth almost twice the luck cap. It lifts the floor of every roll (damage, accuracy and durability on a staff, protection on a shield, tuning on an instrument), never the cap: a shadow wood quarterstaff still tops out at Ruin, it just gets there far more often.

Banecarved rolls on every exceptional weapon, shield or armor piece made from shadow wood or better — plain wood never qualifies. The slayer family is random. A slayer wooden shield absorbs 50% more against its family like any slayer armor; a slayer staff hits it twice as hard. Slayer gear never drops as random loot — only a few named artifacts carry it — so this perk (and its three siblings) is the only source of slayer gear in the material and shape you actually want.

Ultimate — Woodwright's Fortune

Fires on a successful craft at 0.3% per proc level (2.4% at level 8). The chance scales with the size of the craft: anything worth about 20 plain boards or more — a large table, a bed deed, or any colored piece — rolls the full rate, while a stool or a few kindling rolls a fraction, so the proc cannot be farmed on cheap recipes. One roll per craft action, "craft all" included. When it fires, one outcome is rolled — it never fizzles; an outcome that cannot apply falls through to the refund:

Outcome Chance Details
Materials refunded 52% Every board, ingot or cloth the craft consumed comes back — essence included — and you keep the item
Golden part / charged weapon 20.5% A shield or armor piece from colored wood turns into a golden part; a staff or club becomes a charged magic weapon; instruments, furniture and deeds take the refund instead
Magical Essence 10% A pile worth the wood's essence tier — a valorite-wood craft pays 120 (plain wood takes the refund)
Mastery Gem 10% Carpentry-matched
Mastery Soul 5% Carpentry-matched
Mastery Fragment 2.5% Carpentry-matched
Rack of Canvases, Cooper's Bench or Pile of Boards very rare A separate pre-roll before the outcomes above, a little likelier on big colored crafts; one of the three carpentry rares at random — the bench is a two-tile house addon placed from a deed

Earning XP

Crafting masteries earn XP per successful craft, scaled by how much material it consumed and how rare it was. The multipliers run 1 / 3 / 5 / 8 / 12 / 18 per board from plain wood up to valorite (essence you burn counts like plain wood), so a valorite-wood staff levels the mastery 18× faster than a plain one — and a "craft all" run earns for every piece it makes.