Item quality is a hidden item mechanic added in The Binding of Isaac: Repentance, assigned to all items.[1] The quality ranges from 0 to 4 and causes them to behave differently with certain items or automatically get rerolled if certain conditions are met.
Mechanics Affected[]
Bag of Crafting: Determines what kind of item is given by the bag, depending on the pickups put into it.
Birthright ( 
Tainted Bethany): The Lemegeton wisps spawned by this item are guaranteed to be quality 3 or higher.- NO!: If multiple copies, Mom's Box, or a golden version of the trinket is held, items with quality 0 are rerolled.
- Sacred Orb: Automatically rerolls items with a quality of 0 or 1, and has a 33% chance to reroll items with a quality of 2.
- Tainted Lost: 20% chance of rerolling items with a quality of 2 or less.
References[]
- ↑ The qualities and categories are defined in
items_metadata.xml.
 The Binding of Isaac: Rebirth
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