Editing 23a:Item quality

{{av}}{{Quality|Unrated}}
''Also see {{L|Item designations}}.''

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

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

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

__TOC__
== Quality grades ==

All crafted items ({{L|furniture}}, {{L|armor}}, {{L|bolts}}, etc.) &ndash; but not intermediate materials ({{L|bar}}s, {{L|block}}s, etc. except {{L|cloth}}, which does have quality levels) &ndash; are bracketed by characters that show the quality of their craftsdwarfship. Dyeing also has a quality level, as does {{L|Decoration|decorating}} (with gems, leathers, cloth, etc). Prepared foods have quality levels. Alcohol supposedly has a hidden quality rating that controls the amount of happiness a dwarf gets from drinking it. It is not yet known whether the damage or destruction of masterful alcohol can cause tantrums.

{|
! style="padding-right: 35px;" | '''Designation''' || style="text-align: left;" | '''Description''' || style="padding-right: 20px; padding-left: 15px; text-align: center;" | '''Value <br>Modifier''' || style="text-align: center;" | '''Damage / To-Hit /<br>Armor Modifier'''
|-
| &nbsp;Item Name || style="text-align: center;" | — || style="text-align: center;" | ×1 || style="text-align: center;" | ×1.0
|-
| -Item Name- || Well-crafted || style="text-align: center;" | ×2 || style="text-align: center;" | ×1.2
|-
| +Item Name+ || Finely-crafted || style="text-align: center;" | ×3 || style="text-align: center;" | ×1.4
|-
| *Item Name* || Superior quality || style="text-align: center;" | ×4 || style="text-align: center;" | ×1.6
|-
| ≡Item Name≡ || Exceptional || style="text-align: center;" | ×5 || style="text-align: center;" | ×1.8
|-
| ☼Item Name☼ || Masterful || style="text-align: center;" | ×12 || style="text-align: center;" | ×2.0
|-
| ''Unique name'' || Artifact || style="text-align: center;" | ×120 || style="text-align: center;" | ×2.0?*
|}

:''(* An analysis of game memory indicates a base multiplier of 2.0, however observational reports (and some other elements of the game code) imply that the multiplier might be (significantly?) higher.  As it stands, it's not perfectly clear - more research is needed.)''

====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. {{L|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 {{L|chasm}} or is melted by "the impertinent {{L|magma}}", this also counts as defacement, and the maker's mood will decrease drastically. 

Since {{L|legendary}} dwarves are most likely to be the ones creating masterpieces, keeping these creations safe should be high priority; {{L|tantrum}}ing legendary dwarves can be very difficult to subdue (as was discovered the hard way in [[Boatmurdered]]).

====Artifacts====
{{L|Artifact}} items have a unique name instead of bracketing symbols and are worth 120x base value. Artifacts, like masterpiece items, will cause a significant mood drop in the creator when destroyed or stolen.  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 {{L|skill}} levels will ''tend'' to produce items of higher quality.  Looking at the table below, we see that "Dabbling" dwarves never (without an applicable {{L|preference}}) produce anything above a basic "no quality" item, Proficient dwarves (the highest possible skill level at {{L|embark}}) always produce at least some quality and usually +Finely Crafted items+, while {{L|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.  Although the exact adjustment is unknown, preliminary testing indicates that they can boost effective skill (not quality) by one to three levels (if the craftdwarf likes the item type, subtype and material), and overlapping preferences seem to be cumulative (such as for both {{L|silver}} + {{L|axe}}s, or {{L|wood|birch}} + {{L|bed}}s, etc.).<br /><br />
{| border="1" cellpadding="5" cellspacing="0" valign="bottom"
|-
!Lvl !! Skill of dwarf !! No quality !! -Well-crafted- !! +Finely-crafted+ !! *Superior quality* !! ≡Exceptional≡ !! <nowiki>☼</nowiki>Masterful☼ !! Average<br />{{L|Value}} Multiplier !! Jump in<br />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
|-
|}

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

::''(The above table is based on the formula discovered by [[User:0x517A5D|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 (so Legendary +5 don't appear to 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.

==Effects of Quality==

Most obviously, quality influences the {{L|value|monetary worth}} of an object, for purposes of {{L|trade|trading}} and determining price (the latter once {{L|economy}} starts). Destruction of a {{L|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 {{L|prepared meals}} give dwarfs who consume them more {{L|thought|happiness}}.

===Furniture===

Because {{L|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:
<div style="width: 50em; padding: 0.5em; margin-bottom: 1em; border: 1px solid #ccc; background: #eee;">
The quality of any weapon, including {{L|crossbow}}s 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<sub>new</sub> = Skill<sub>original</sub> &times; (1.0 + 0.2 &times; Q) + Q

This is pretty extreme and will probably be reduced for all weapons.
</div>

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.

{| border="1" cellpadding="5" cellspacing="0" valign="bottom"
|-
!Result for  !!Well-crafted!!Finely-crafted!!Superior quality!!Exceptional!!Masterful
|-
|Dabbling    ||No label    ||Skilled       ||Talented        ||Expert     ||Accomplished
|-
|Novice      ||Competent   ||Proficient    ||Expert          ||Accomplished||Master
|-
|No label    ||Skilled     ||Adept         ||Professional    ||Master     ||Grand Master
|-
|Competent   ||Talented    ||Expert        ||Great           ||High Master||Legendary
|-
|Skilled     ||Adept       ||Accomplished  ||Master          ||Legendary  ||Legendary
|-
|Proficient  ||Expert      ||Great         ||Grand Master    ||Legendary  ||Legendary
|-
|Talented    ||Professional||Master        ||Legendary       ||Legendary  ||Legendary
|-
|Adept       ||Accomplished||Grand Master  ||Legendary       ||Legendary  ||Legendary
|-
|Expert      ||Master      ||Legendary     ||Legendary       ||Legendary  ||Legendary
|-
|Professional||High Master ||Legendary     ||Legendary       ||Legendary  ||Legendary
|-
|Accomplished||Grand Master||Legendary     ||Legendary       ||Legendary  ||Legendary
|-
|Great and better||Legendary||Legendary    ||Legendary       ||Legendary  ||Legendary
|}

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

# Train a couple dozen skilled miners
# Give them exceptional picks
# Draft them and give them decent armor
# 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

{{Category|Items|*Quality}}