Modifiers generally change various aspects of the entity they are affecting. Most commonly modifiers apply stats, however they can also apply buffs or grant skills and can often be found on items, monsters, strongboxes or areas.
A modifier should be seen as an instance of change applied to an entity. A basic modifier does nothing on its own, it is given the effect by the associated stats (and their values), buffs and skills.
Often it is also distinguished between implicit and explicit modifiers which are visually separated on items descriptions.
Effects
For stats modifiers include a minimum and maximum value, which is most commonly found on Item Affixes - the actual value of the stat in the cases where minimum and maximum are not the same will be randomized within, so for example a Stat with a minimum value of 1 and a maximum value of 3, can either be 1, 2 or 3.
If a buff is specified, Modifiers also include a value for the buff, but unlike for Stats it is not randomized and fixed.
If a skill is specified, the specified skill (at the specified level) will be granted to the relevant entity. The skill does not include values as they're defined by the skill level directly. Often this is found on items, where they grant skills, such as 
The Whispering IceThe Whispering Ice
Vile StaffWarstaff
Quality: +20%
Physical Damage: 49.2-91.2
Critical Strike Chance: 6.10%
Attacks per Second: 1.30
Weapon Range: 13Requires Level 33, 59 Str, 59 Int+18% Chance to Block Attack Damage while wielding a Staff+1 to Level of Socketed Support Gems
Grants Level 1 Icestorm Skill
Plays Whispering Ice sound on killing a rare Monster (Hidden)
(14-18)% increased Intelligence
(8-12)% increased Cast Speed
1% increased Spell Damage per 10 IntelligenceGuard your darkest thoughts well, for they are
the cracks through which the Nightmare crawls.
unique item.
Note that the effects of a modifier may be hidden, as some stats do not have direct description/translation visible to the player.
Implicit modifiers
Implicit modifiers always spawn on entities before the addition or change of additional modifiers (for example by changing the rarity).
On monsters, implicit modifiers can be very commonly found. For example, some monsters are granted damage conversion which converts their inherent damage to that of another element. However, on unique monsters and bosses implicits are most notable - for example most bosses are granted a boost to their item rarity and item quantity as well as other bonuses such as on Atziri.
On items, visible implicit modifiers are most commonly found on:
- Rings
- Amulets
- Belts
- Quivers
- Most weapons
- Shields
- Specific body armour (Astral Plate, Assassin's Garb, Occultist's Vestment, and Carnal Armour.)
Shields and body armour also commonly have a hidden movement speed penalty modifier.
Unlike the implicit modifiers on monsters, the implicit modifiers on equipment can be by altered in various ways:
Blessed OrbBlessed OrbStack Size: 20Randomises the numeric values of the implicit modifiers of an itemRight click this item then left click another item to apply it.
Shift click to unstack. - rerolls the range of the stats found on the implicit modifiers.- Vaal OrbVaal OrbStack Size: 10Corrupts an item, modifying it unpredictablyRight click this item then left click an item to corrupt it. Corrupted items cannot be modified again.
Shift click to unstack. - Corruption can add or replace an implicit modifier depending on the item type. - Enchantment - Enchanting gloves, boots or helmets can give them a new implicit modifier.
Certain unique items also have special interactions with implicits:
- Greatwolf TalismanGreatwolf TalismanTalisman Tier: 4<Two random talisman implicit modifiers>CorruptedThe wolf greeted the king,
In the light of the harvest moon.
The wolf offered the strength of the wild,
And the king paid for it in blood. - has two randomly chosen talisman implicits.
Explicit modifiers
Explicit modifiers are generally dynamically generated by changing the rarity of the entity or by other modification.
The number of affixes given by rarity depends on the rarity class:
- Magic - random modifiers based on conditions: (0 to 1) prefix and (0 to 1) suffix
- Rare - random modifiers based on conditions: (1 to 3) prefixes and (1 to 3) suffixes (but always at least 3) with the exception of jewels which can only have (1 to 2) prefixes and (1 to 2) suffixes
- Unique - non-random, fixed modifiers based on the unique entity
Monsters have additional means of receiving modifiers:
- Magic packs of monsters may receive a Bloodlines modifier
- Rare monsters may receive a Nemesis modifier
- Normal and Magic monsters may be touched by a Tormented Spirit, giving a Torment 'Touch' modifier
- Rare and Unique monsters may be possessed by a Tormented Spirit, giving a Torment 'Possession' modifier
- Picking up a Talisman gives monsters a Talisman modifier
On items, modifiers can be changed by spending currency:
- Divine OrbDivine OrbStack Size: 10Randomises the numeric values of the random modifiers on an itemRight click this item then left click a magic, rare or unique item to apply it.
Shift click to unstack. rerolls the value of any stats on explicit modifiers on the item - Orb of ScouringOrb of ScouringStack Size: 30Removes all modifiers from an itemRight click this item then left click on a magic or rare item to apply it.
Shift click to unstack., Orb of TransmutationOrb of TransmutationStack Size: 40Upgrades a normal item to a magic itemRight click this item then left click a normal item to apply it.
Shift click to unstack., Orb of AlchemyOrb of AlchemyStack Size: 10Upgrades a normal item to a rare itemRight click this item then left click a normal item to apply it.
Shift click to unstack., Orb of ChanceOrb of ChanceStack Size: 20Upgrades a normal item to a random rarityRight click this item then left click a normal item to apply it.
Shift click to unstack. and Regal OrbRegal OrbStack Size: 10Upgrades a magic item to a rare itemRight click this item then left click a magic item to apply it. Current modifiers are retained and a new one is added. may be used to alter the rarity of an item (adding/removing mods in the process) - Orb of AlterationOrb of AlterationStack Size: 20Reforges a magic item with new random modifiersRight click this item then left click a magic item to apply it.
Shift click to unstack. and Chaos OrbChaos OrbStack Size: 10Reforges a rare item with new random modifiersRight click this item then left click a rare item to apply it.
Shift click to unstack. may be used to re-roll the modifiers on Magic and Rare items respectively - Orb of AugmentationOrb of AugmentationStack Size: 30Augments a magic item with a new random modifierRight click this item then left click a magic item to apply it. Magic items can have up to two random modifiers.
Shift click to unstack. and Exalted OrbExalted OrbStack Size: 10Augments a rare item with a new random modifierRight click this item then left click a rare item to apply it. Rare items can have up to six random modifiers. may be used to add a random modifier on Magic and Rare items respectively - Vaal OrbVaal OrbStack Size: 10Corrupts an item, modifying it unpredictablyRight click this item then left click an item to corrupt it. Corrupted items cannot be modified again.
Shift click to unstack. has a chance to change the rarity or create maps with 8 Modifiers
Areas may receive modifiers depending on how they were created unlike items, monsters or strongboxes:
- Corrupted areas as they have the 'secret_area' tag will receive (0 to 1) prefixes and (0 to 1) suffixes that satisfy that tag
- Areas created with Map items receive the modifiers on the map they were created with
- Areas created through a Map device may receive mods from placing map fragments in the device
- The current league(s) or other server-wide effects (from races for example)
- With Tempest league active in the area, the area may receive a tempest modifier
Conditions
Modifiers usually include conditions which are used to determine how they appear. These are generally used to govern the creation of explicit modifiers on entities.
Mod Domain
The mod generation determines what entity the mod applies to. The domains are primarily reverse engineered, as detailed information has been removed from the game files.
| Id | Type | Description |
|---|---|---|
| 1 | Item | The mod is generated on items (but not jewels or flasks) |
| 2 | Flask | The mod is generated on flasks |
| 3 | Monster | The mod is generated on monsters |
| 4 | Chest | The mod is generated on Chests (i.e. Strongboxes) |
| 5 | Area | The mod is generated on areas |
| 6 | Unknown | |
| 7 | Unknown | |
| 8 | Unknown | |
| 9 | Stance | The mod is generated as a Stance (appears to be animation related) |
| 10 | Master | The mod is generated by masters through master crafting |
| 11 | Jewel | The mod is generated on jewels |
| 12 | Atlas | The mod is generated by Cartographer's Sextants. |
| 13 | Leaguestone | The mod is generated by leaguestones. |
| 14 | Abyss Jewel | The mod is generated by abyss jewels. |
| 15 | Map Device |
Mod Generation Type
The mod generation determines "how" the mod will be created on an item. The generation types are primarily reverse engineered, as detailed information has been removed from the game files.
| Id | Type | Description |
|---|---|---|
| 1 | Prefix | The mod is generated as prefix, for example Item Prefix. |
| 2 | Suffix | The mod is generated as suffix, for example Item Suffix. |
| 3 | Unique | The mod is "unique" - it is given directly to the relevant entity and not generated normally. For example, the mods on unique items and implicit modifiers have this property. |
| 4 | Nemesis | The mod is a Nemesis mod. |
| 5 | Corrupted | The mod is a Corrupted mod and is given to the item upon corruption. |
| 6 | Bloodlines | The mod is a Bloodlines mod. |
| 7 | Torment | The mod is a Torment mod. |
| 8 | Tempest | The mod is a Tempest mod. |
| 9 | Talisman | The mod is a Talisman monster mod. |
| 10 | Enchantment | The mod is a mod granted by Enchantment. |
| 11 | Essence | The mod is a mod granted by Essences. |
Level
The required level of the relevant entity. For example, this can be the required item level or a monster level.
However, there are cases where this is not respected though. In particular this is the case for any mods that are directly given to other entities, such as implicit mods including enchantments or monsters with innate mods.
The mod level is also a factor in calculating the level requirement of items raising the level requirement to 80% requirement of the mod (with the requirement rounded down to the nearest whole integer). In particular this is the case for mods on unique items and for enchantments
For example, 
Seven-League StepSeven-League Step
Rawhide BootsQuality: +20%
Evasion: 1550% increased Movement Speed
Level Requirement reduced by 100 (Hidden)"Death can be outrun with these, but beware!
In running from death, you may forget to live."
- Icius Perandus, Antiquities Collection, Item 202
normally has a level requirement of {{#show: Seven-League Step|?Has level requirement range text}}, however putting the {{#show:Modifier:EnchantmentLifeAndManaLeechOnKill2~|?Has stat text}} enchantment from the 3rd labyrinth on it, will increase the level requirement to
Failed to parse (syntax error): \color[RGB]{163,141,109} \left \lceil{{{#show:Modifier:EnchantmentLifeAndManaLeechOnKill2~|?Has level requirement}} \times 0.8 }\right \rceil = <strong class="error">Expression error: Unrecognized punctuation character "{".</strong>
.
Mod Group
Mods have a single group associated with them. Only one mod from a group can appear at a time, as such all mods in specific group are mutually exclusive.
As the name suggests, this primarily used to group various types of modifiers together.
For example, on items this is used a lot for the prefix and suffix generation to create those group of modifiers that modify only a single or two stats. Together with the item level requirements, this creates the "tiered" system of modifiers.
Tags
Some mods use the internal Tag system to determine on which entities they can appear and how likely they are to appear on entities. A mod can add tags to the entity it is modifying.
It primarily functions like this:
- Find the Tags on the entity.
- Match the Tags against the mod's list of tags.
- For the found mods get the associated spawn weighting of the tag.
- If the spawn weighting is zero, discard the mod, otherwise use it.
- If multiple tags apply, the left-most tags are most important, where the right most tags are the least.
So, for example:
- Glorious PlateGlorious PlateArmour: 776Requires Level 68, 191 Str has the tags
[{{#show: Glorious Plate|?Has tags}}]. - Assassin's GarbAssassin's GarbEvasion: 737Requires Level 68, 183 Dex3% increased Movement Speed has the tags
[{{#show: Assassin's Garb|?Has tags}}]. - The mod Template:SMW query mod has the tags
[{{#ask:
[[-Has subobject::Is mod::LocalIncreasedPhysicalDamageReductionRatingPercent7
]]
|?Has tag
|headers=hide
|mainlabel=-
|sort=Is tag number
|format=list
|link=none
}}] with the spawn weights [{{#ask:
[[-Has subobject::Is mod::LocalIncreasedPhysicalDamageReductionRatingPercent7
]]
|?Has spawn weight#
|headers=hide
|mainlabel=-
|sort=Is tag number
|format=list
|link=none
}}].
- Result for Glorious PlateGlorious PlateArmour: 776Requires Level 68, 191 Str: The mod can spawn because it has the tag str_armour and a positive spawn weight.
- Result for Assassin's GarbAssassin's GarbEvasion: 737Requires Level 68, 183 Dex3% increased Movement Speed: The mod can not spawn because only default matches and its spawn weight is 0.
Developer information
Relevant data can be found in the content.ggpk
| Mods | Data/Mods.dat
|
List of mods with their associated stats & values, buffs and skills, conditions |
| Mod Domains | Data/ModsDomains.dat
|
empty |
| Mod Generation Types | Data/ModsGenerationTypes.dat
|
empty |
Note that many other .dat files link to the relevant row of Mods.dat.