Affixes

Modifiers are special attributes that can randomly generate on Gear items, making them more powerful or giving them utility.

Modifier Generation Mechanics
Not all modifiers can generate on all items. Several properties possessed by these modifiers restrict what items can generate with them: These restrictions do not apply to the guaranteed modifiers of Legendary Items, which are generated after all other modifiers. As a result, Legendary items often have combinations of modifiers which are unobtainable on other kinds of items.
 * Item Class Restriction (Item Class): If assigned, has a value of either 0, 1, 2, or 3.
 * 0: Modifier can only appear on Weapons
 * 1: Modifier can only appear on Skills
 * 2: Modifier can only appear on Weapons and Skills
 * 3: Modifier can only appear on Amulets
 * Required Tags: A given modifier can only appear on items with all of the required tags.
 * Forbidden Tags: A given modifier can only appear on items with none of the forbidden tags.
 * Forbidden Modifiers: A given modifier can only appear on items which have not already generated with any of the forbidden modifiers.
 * Forbidden Items: A given modifier cannot appear on forbidden items.
 * Cost Impact: A given modifier will increase the price of the item, by a percentage of its base price.

Stat-Boosting Modifiers
Stat-boosting modifiers are the only modifiers which can be applied multiple times to the same item. Only present on Amulets and the Hunter's Grenade, they grant Stats to the player while these are equipped. The effects bestowed by these stats are listed just underneath the white text in the item's tooltip.

Minor Modifiers
Minor modifiers are written in green text. The number of minor modifiers on an item is limited only by the modifier cap imposed by its gear level.

Major Modifiers
Major modifiers grant powerful effects. A single item may only have one major modifier generate normally, except in some special cases like Legendary items. These rare modifiers have either a star, a skull with multiplier (Double/Quad Damage), or a blood drop (Leech) in front of them.

Removed Modifiers
These modifiers have been removed from the game.

Trivia

 * The "Can break shields" affix has several inconsistencies:
 * It cannot break physical shields on some enemies, such as the Ground Shaker, Shieldbearer and Oven Knight, nor could it bypass the contact damage from striking a Throny in the back. However, as it cannot legitimately spawn on other weapons, this can only be seen through modding.
 * The only shield it is capable of breaking is the force field surrounding the King in the Throne Room.
 * It is, however, capable of damaging enemies through force fields, reinforced by the fact that its internal name is "Ignore Global Shield", while "Global Shield" is the alias of the Force Field status effect.