23a:Item quality

xTATTEREDx  · +FINE+  · *SUPERIOR*  · ≡EXCEPTIONAL≡  · ☼MASTERWORK☼

v50.14 · v0.47 · v0.34 · v0.31 · v0.28 · v0.23.130.23a This article is about an older version of DF. More Info · V

Also see Item designations.

All items in the game have a base value, which is multiplied by what material the item is made of and by the item's quality. Decorations (such as bone, gems, and studding) further increase the value.

Item quality can have an effect on an item's properties, especially armor and weapons.

Rooms also have a "quality grade" which determines their value in the eyes of those owning/using the room, which is the sum of the objects placed within their designated area plus the materials that surround it plus improvements (such as engraving) to those materials. See room for a more complete discussion of these values, and How do I increase the value of a room for a complete list of options.

Quality grades

All crafted items (furniture, armor, bolts, etc.) – but not intermediate materials (bars, blocks, etc. except cloth, which does have quality levels) – are bracketed by characters that show the quality of their craftsdwarfship. Dyeing also has a quality level, as does decorating (with gems, leathers, cloth, etc). Prepared foods have quality levels, but simple foods and drinks do not.

Designation	Description	Value Modifier	Damage / To-Hit / Armor Modifier
Item Name	—	×1	×1.0
-Item Name-	Well-crafted	×2	×1.2
+Item Name+	Finely-crafted	×3	×1.4
*Item Name*	Superior quality	×4	×1.6
≡Item Name≡	Exceptional	×5	×1.8
☼Item Name☼	Masterful	×12	×2.0
Unique name	Artifact	×120	×2.0

Masterpiece

A masterpiece is more than the highest normal quality and value - it is an artistic expression that is of great importance to the dwarf who created it.

When a masterful quality item is created, the game will announce, "<dwarf> has created a masterpiece!" The loss, destruction or theft of such a masterpiece will cause the dwarf that created it a very unhappy thought. Trading a masterpiece item to merchants is always safe. Masterpiece meals can be eaten safely, although allowing the food to rot will provoke the same response as theft or destruction. Using masterpiece bolts will not cause a tantrum, even if the bolts break - however, losing a bolt, even one left on the battlefield, will. So if a kobold or wild animal steals a used masterpiece bolt which was lying around, or misses its target and falls into the chasm or is melted by "the impertinent magma", this also counts as defacement, and the maker's mood will decrease drastically.

Since legendary dwarves are most likely to be the ones creating masterpieces, keeping these creations safe should be high priority; tantruming legendary dwarves can be very difficult to subdue (as was discovered the hard way in Boatmurdered).

Artifacts

Artifact items have a unique name instead of bracketing symbols and are worth 120x base value. Unlike masterpiece items, losing an artifact will not result in unhappiness unless the current owner is obsessed with it - in this case, losing the artifact will cause said dwarf to go insane. According to inspections of the memory values, it seems that artifacts have the same quality value as masterpiece items. It is unclear if this is true for weapons/armor or not - opinions differ as to whether artifact weapons and armor have a 2.0 multiplier or something higher; nothing has been found in the game code to support such, but observation suggests otherwise.

Skill and quality levels

Tradesdwarves of higher skill levels will tend to produce items of higher quality. Looking at the table below, we see that "Dabbling" dwarves never (without an applicable preference) produce anything above a basic "no quality" item, Proficient dwarves (the highest possible skill level at embark) always produce at least some quality and usually +Finely Crafted items+, while legendary dwarves usually (65% of the time) produce ≡Exceptional items≡, and the best legendary dwarves produce nothing less than ≡Exceptional≡ and produce ☼Masterful items☼ approximately 27% of the time.

Preferences for particular materials and/or objects make a considerable difference in the odds of producing better quality items - specifically, matching item preferences and matching material preferences each provide a +1 skill level boost, possibly beyond Legendary+5.

Lvl	Skill of dwarf	No quality	-Well-crafted-	+Finely-crafted+	*Superior quality*	≡Exceptional≡	☼Masterful☼	Average Value Multiplier	Jump in Average Value
0	Dabbling	100.0%						1.000
1	Novice	63.0%	31.4%	5.2%	0.38%	0.01%	0.000089%	1.430	0.430
2	Adequate	36.4%	44.1%	16.7%	2.6%	0.16%	0.0028%	1.860	0.430
3	Competent	18.3%	43.8%	29.4%	7.7%	0.79%	0.022%	2.291	0.431
4	Skilled	6.7%	35.6%	39.4%	15.8%	2.4%	0.091%	2.725	0.434
5	Proficient*		23.3%	44.4%	26.4%	5.6%	0.28%	3.167	0.441
6	Talented		15.5%	41.5%	33.3%	9.2%	0.58%	3.415	0.248
7	Adept		9.4%	36.3%	39.2%	14.0%	1.1%	3.674	0.259
8	Expert		5.0%	29.7%	43.5%	20.0%	1.8%	3.949	0.275
9	Professional		1.9%	22.2%	45.8%	27.2%	2.9%	4.245	0.296
10	Accomplished			14.4%	45.6%	35.6%	4.4%	4.567	0.322
11	Great			10.2%	42.4%	41.4%	5.9%	4.785	0.218
12	Master			6.7%	38.2%	47.4%	7.7%	5.021	0.236
13	High Master			3.9%	33.0%	53.3%	9.8%	5.276	0.255
14	Grand Master			1.6%	26.9%	59.2%	12.2%	5.552	0.276
15	Legendary				20.0%	65.0%	15.0%	5.850	0.298
16	Legendary+1				15.7%	67.2%	17.1%	6.037	0.187
17	Legendary+2				11.6%	69.1%	19.3%	6.233	0.195
18	Legendary+3				7.6%	70.8%	21.6%	6.436	0.203
19	Legendary+4				3.7%	72.2%	24.1%	6.647	0.211
20	Legendary+5					73.3%	26.7%	6.867	0.219
21	Legendary+6**					72.0%	28.0%	6.96	0.093
22	Legendary+7**					70.7%	29.3%	7.053	0.093
23	Legendary+8***					69.3%	30.7%	7.146	0.093
24	Legendary+9***					68.0%	32.0%	7.24	0.093
25	Legendary+10***					66.7%	33.3%	7.333	0.093

(* Proficient is the highest level a dwarf can have at embark.)

(** Legendary+6 and Legendary+7 can only be reached by making items that coincide with the dwarf's preferences)

(** Legendary+8 thru Legendary+10 are only relevant for certain non-crafting-related skills, such as Farming, Fishing, and Plant Gathering)

(The above table is based on the formula discovered by 0x517A5D)

The math behind the curtain

The in-game calculations to determine final quality of a product work like this: first, a skill level is computed, directly related to the dabbling through legendary+5 indicators and preferences of the particular crafter. "No skill" or dabbling is 0, proficient is 5, legendary is 15, etc. Skill levels are capped at 20, then item/material preference bonuses are added (so Legendary +5 will produce Masterpieces more often in their preferences).

Item quality is set to 0.

Then dice are rolled. Each roll is independent; all rolls are made even if a previous roll fails.

• If d5 < skill level, quality of final product is bumped.
• If d10 < skill level, quality is bumped.
• If d15 < skill level, quality is bumped.
• If d20 < skill level, quality is bumped.
• If d25 < skill level and d3 == 1, quality is bumped.

This gives the 6 quality levels (0 to 5).

According to inspections of the memory values, it seems that artifacts have a quality of 5.

Full code breakdown here:

Here is Quietust's disassembly and analysis of version 0.23.130.23a: ; First, check what skill is being used push 1 ; ignore_building mov ecx, ebx ; job * call job_getSkill ; Next, get the level of that skill, if there is one (if not, it will use 0 instead) mov edi, [esp+2Ch+maker] push eax ; skill mov ecx, edi ; unit * call unit_getSkillLevel ; Cap the skill level to a maximum of 20 mov esi, eax cmp esi, 20 mov [ebp+item_craftedst.skill_level], si jle short loc_5DC657 mov esi, 20 ; Check if the item's type/subtype match any Item preferences in the maker loc_5DC657: mov eax, [ebp+itemst.vftable] push 1 ; activatePrefs push -1 ; matgloss push -1 ; material mov ecx, ebp call [eax+vtable_item.getSubtype] mov edx, [ebp+itemst.vftable] push eax ; item_subtype mov ecx, ebp call [edx+vtable_item.getType] push eax ; item_type push LikeItem ; prefType mov ecx, edi ; unit * call unit_likesItem test al, al jz short loc_5DC67C inc esi ; if so, increase skill level by 1 ; Check if the item's material/matgloss match any Material preferences in the maker loc_5DC67C: mov ax, [ebp+item_craftedst.material] cmp ax, 0FFFFh ; skip if item has no material jz short loc_5DC6A0 mov cx, [ebp+item_craftedst.matgloss] push 1 ; activatePrefs push ecx ; matgloss push eax ; material push -1 ; item_subtype push -1 ; item_type push LikeMaterial ; prefType mov ecx, edi ; unit * call unit_likesItem test al, al jz short loc_5DC6A0 inc esi ; if so, increase skill level by 1 ; We roll a d5 and compare the result with the creator's skill level. ; (Technically, we compare d5 - 1 against skill_level - 1.) loc_5DC6A0: push 5 ; max mov [ebp+item_craftedst.quality], 0 call trandom ; generate number from 0-4 add esp, 4 cmp eax, esi jge short loc_5DC6B8 ; If the random number was less than ; the skill level, increment quality inc [ebp+item_craftedst.quality] ; Now we roll a d10 and compare. It's important to note that the roll ; of the d10 is independent, not conditional, of the roll of the d5. loc_5DC6B8: push 10 ; max call trandom add esp, 4 cmp eax, esi jge short loc_5DC6CA ; If d10 < skill, bump quality inc [ebp+item_craftedst.quality] loc_5DC6CA: ; Same thing for a d15 push 15 ; max call trandom add esp, 4 cmp eax, esi jge short loc_5DC6DC ; If d15 < skill, bump quality inc [ebp+item_craftedst.quality] loc_5DC6DC: ; Same thing for a d20 push 20 ; max call trandom add esp, 4 cmp eax, esi jge short loc_5DC6EE ; If d20 < skill, bump quality inc [ebp+item_craftedst.quality] loc_5DC6EE: ; Now we roll a d25 push 25 ; max call trandom add esp, 4 cmp eax, esi ; Compare against skill, jge short loc_5DC70E push 3 ; max call trandom ; AND roll a d3 add esp, 4 test eax, eax ; The d3 result must be 1. ; (Technically, d3-1 is tested against 0.) jnz short loc_5DC70E ; If d25 < skill AND d3 = 1, bump inc [ebp+item_craftedst.quality] loc_5DC70E: cmp [ebp+item_craftedst.quality], 5 jnz loc_5DC7EC ... mov dword ptr [esp+2Ch+__$EHRec$.state], eax lea eax, [esp+2Ch+message] push eax ; str push edi ; name call formatLanguageName mov edi, offset aHasCreatedAMas ; " has created a masterpiece!" ...

Effects of Quality

Most obviously, quality influences the monetary worth of an object, for purposes of trading and determining price (the latter once economy starts). Destruction of a masterwork will also cause relevant unhappiness. However, for some items, quality may also influence other things.

Note that this is not a complete list.

Food

Higher quality prepared meals give dwarves who consume them more happiness.

Furniture

Because room quality is based on total value of the furniture in a room, high-quality furniture will result in high quality rooms, which provide more satisfaction for the occupants.

Weapons

To quote Toady:

The quality of any weapon, including crossbows used as launchers, affects the skill of the shooter. I think this even leads to obscene things like master crossbows + master bolts causing recruits to shoot like legends. In general, if the quality Q is from 0 to 5, the skill is modified according to

Skill_new = Skill_original × (1.0 + 0.2 × Q) + Q

This is pretty extreme and will probably be reduced for all weapons.

See this chart for the exact levels:

Note: This chart is out of date/wrong due to the facts that the integer that represents a specific skill level is not known, how the formula rounds is not known, and the fact that higher legendaries exist is known.

Result for	Well-crafted	Finely-crafted	Superior quality	Exceptional	Masterful
Dabbling	Novice	No-label	Competent	Skilled	Proficient
Novice	No label	Competent	Skilled	Proficient	Adept
No label	Competent	Skilled	Talented	Adept	Professional
Competent	Skilled	Talented	Adept	Professional	Great
Skilled	Proficient	Adept	Professional	Great	High Master
Proficient	Adept	Professional	Great	High Master	Legendary
Talented	Expert	Accomplished	Master	Grand Master	Legendary
Adept	Professional	Great	Grand Master	Legendary	Legendary
Expert	Accomplished	High Master	Legendary	Legendary	Legendary
Professional	Great	Grand Master	Legendary	Legendary	Legendary
Accomplished	High Master	Legendary	Legendary	Legendary	Legendary
Great	Grand Master	Legendary	Legendary	Legendary	Legendary
Master+	Legendary	Legendary	Legendary	Legendary	Legendary

If this is true, then it would be possible to:

1. Train a couple dozen skilled miners
2. Give them exceptional picks
3. Draft them and give them decent armor
4. Kill a goblin siege with a couple dozen legendary speardwarves (picks = 70% damage spears) as long as there are no enemy champions to destroy your armour/shield/wrestling inept speardwarves