Crafting quality system

How item quality is determined at craft time, quality tiers, lore display, the UO-style repair system, and stack size bonuses.

Every craftable item receives a quality tier when it is made. Crafting never fails — you always receive an item, but its quality depends on your skill relative to the item’s difficulty.

Quality tiers

Quality	Short	Skill condition	Judgment	Damage / AR	Durability
Low Quality	LQ	Skill < Difficulty	Deterministic	×0.80	−25% (extra durability loss)
Normal Quality	NQ	Skill ≥ Difficulty, but < Difficulty+20	Deterministic	×1.00	No change
High Quality	HQ	Skill ≥ Difficulty+20	Probabilistic	×1.20	+30% (33% chance to skip durability loss)
Exceptional	EX	Skill ≥ Difficulty+30	Probabilistic	×1.50	+50% (50% chance to skip durability loss)

Quality modifiers are relative to item difficulty, not absolute skill values. A Crafting skill of 65 produces NQ iron gear (difficulty 25, so skill is +40 over difficulty → HQ is possible), but only LQ Netherite (difficulty 60, so skill is +5 — below threshold).

Quality judgment flow

The system evaluates quality in this order:

1. Compare skill to item difficulty

   Calculate skillOverDifficulty = Skill − Difficulty.

   • If skillOverDifficulty < 0 → LQ (confirmed, no roll needed)
   • If 0 ≤ skillOverDifficulty < 20 → NQ (confirmed, no roll needed)
   • If skillOverDifficulty ≥ 20 → proceed to HQ/EX probability zone
2. HQ probability check (skill +20 to +40 over difficulty)

   HQ Chance = (skillOverDifficulty − 20) × 5%
   

   At +20 over difficulty: 0% chance. At +30: 50%. At +40: 100% (HQ guaranteed).

   If the roll fails → NQ.

3. EX probability check (skill +30 or more over difficulty)

   EX is checked before the HQ result is finalized:

   EX Chance = (skillOverDifficulty − 30) × 2%
   

   At +30 over difficulty: 0% EX chance. At +40: 20%. At +50: 40%.

   If the EX roll succeeds → EX. Otherwise the result is HQ (if HQ roll also passed).

4. HQ guaranteed zone (skill +40 or more over difficulty)

   At +40 or more over difficulty, HQ is always the floor. Only the EX roll matters:

   EX Chance = (skillOverDifficulty − 30) × 2%
   

   If EX fails → HQ.

Worked examples

Crafting skill	Item difficulty	Over difficulty	Result
20	25	−5	LQ (confirmed)
40	25	+15	NQ (confirmed)
50	25	+25	HQ 25% chance, else NQ
65	25	+40	HQ guaranteed; EX 20% chance
90	60	+30	HQ 50% chance; EX 0% chance
100	60	+40	HQ guaranteed; EX 20% chance

Item lore display

Quality information is embedded in the item’s lore:

Iron Sword
[High Quality]
Crafter: PlayerName    ← EX only

Quality	Lore line	Crafter line
LQ	[Low Quality]	No
NQ	(no quality line)	No
HQ	[High Quality]	No
EX	[Exceptional]	Yes

The crafter name on EX items is the player’s name. Boss-drop EX items carry one of the three legendary smiths as the crafter: Zardoz, Volund, or Mondain.

Durability behavior

Durability is modified via PlayerItemDamageEvent:

Quality	Behavior
LQ	Extra durability loss on each hit
NQ	Standard vanilla durability loss
HQ	33% chance to cancel each durability loss tick
EX	50% chance to cancel each durability loss tick

UO-style repair system

Repairing at an anvil permanently reduces the item’s maximum durability. Higher Crafting skill minimizes the loss.

Max Durability Lost Per Repair = (110 − Crafting) / 10

Crafting skill	Max durability loss
0	11 points
50	6 points
100 (GM)	1 point

The current and maximum durability are shown in the item lore and color-coded:

Durability %	Color
> 75%	Green
50–75%	Yellow
25–50%	Orange
< 25%	Red

Mending enchantment

Mending success depends on Crafting skill. On a failed proc, the experience orb goes to the player but the item is not repaired.

Mending Success Rate = min(100%, Crafting × 100 / 60)

Crafting skill	Mending success
0	0%
20	33%
30	50%
40	67%
50	83%
60+	100%

Skill 60 is the practical threshold for reliable Mending. Below that, mending procs are unpredictable.

Elytra and Turtle Shell helmets are exempt — their Mending always succeeds regardless of Crafting skill.

Stack size bonus

Higher production skill levels allow stackable items to exceed the standard limit of 64.

Skills that contribute

• Crafting
• Cooking
• Inscription

Stack Limit = 64 + floor((Crafting + Cooking + Inscription) / 300 × 35)

Combined skill total	Stack limit
0	64
100	~76
150	~82
200	~87
300	99

When the bonus applies

The increased stack limit is applied automatically in three situations:

1. Picking up an item from the ground
2. Extracting an item from a container (chest, furnace, etc.)
3. Logging in (existing inventory is updated to reflect current limits)