The Binding of Isaac: Rebirth Item Quality Tier List
Complete guide to Isaac's hidden item quality system (0-4). Learn which items are quality 4, how Sacred Orb and Tainted Lost use quality, and community tier rankings for Repentance+.
Repentance introduced a hidden quality rating assigned to every item from 0 (worst) to 4 (best). Quality affects Sacred Orb rerolls, Tainted Lost's shop and devil deal filtering, NO! active item blocking, and general community tier list discussions. Unlike subjective tier lists based on player opinion, quality is a hardcoded game value that determines mechanical interactions. Understanding quality helps you evaluate whether an item is worth picking up and predict how reroll tools will behave.
Quality Tiers Explained
| Quality | Tier Label | Examples | Mechanics |
|---|---|---|---|
| 4 | S-Tier | Sacred Heart, R Key, Crown of Light, Psy Fly | Tainted Lost only sees Q4 in shops/devil. Sacred Orb upgrades to Q4. |
| 3 | A-Tier | Brimstone, Mom's Knife, Proptosis, Cricket's Head | Strong items that carry most runs. |
| 2 | B-Tier | Technology, Cupid's Arrow, Halo, Pentagram | Solid items that improve runs significantly. |
| 1 | C-Tier | Boom!, Best Bud, Butter Bean, The Poop variants | Situational or weak. Blocked by NO! (active). |
| 0 | D-Tier | The Poop, Dead Onion, Cursed Eye (debated) | Weakest items. NO! blocks these actives. |
Quality 4 Items — The Elite Tier
Quality 4 items represent the strongest items in Isaac. Sacred Heart grants two soul hearts and a 2.3x damage multiplier with spectral piercing tears. R Key restarts the current floor, enabling infinite rerolls on shop and treasure items. Crown of Light doubles damage while you have no empty heart containers. Psy Fly orbitals block projectiles and deal contact damage. Mega Mush provides massive stat boosts across the board. These items define run-winning builds and are prioritized by every reroll mechanic in the game.
How Quality Affects Gameplay Systems
- Sacred Orb — Automatically rerolls quality 0-2 boss drops and shop items into quality 3-4 alternatives from the same pool.
- Tainted Lost — Only quality 4 items appear in devil deals and shops. All other items show as The Void.
- NO! — Prevents quality 0 and 1 active items from appearing in shops and devil deals entirely.
- Spindown Dice — Decrements item IDs; quality helps predict what reroll results might appear.
- Bag of Crafting — Higher quality ingredients produce better crafted items.
Community Tier List vs Quality
Community tier lists rank items by practical run impact, which sometimes diverges from quality ratings. Ipecac is quality 3 but can ruin runs by preventing direct tears. Cursed Eye is low quality but enables powerful charged tear builds. Dr. Fetus is quality 3 but requires careful bomb management. Use quality as a mechanical reference and community tier lists for strategic evaluation. Our synergies guide explains which lower-quality items become S-tier through specific combinations.
Repentance+ rebalanced several item qualities and effects. Always check the latest patch notes on our Repentance+ guide for recent changes. For finding quality 4 items efficiently, combine Sacred Orb with shop reroll machines and prioritize angel rooms on characters who benefit from soul heart items.
Frequently Asked Questions
Is item quality visible in-game?
No. Quality is a hidden stat. Repentance+ added an Item Descriptions toggle for previously collected items, but quality numbers are not shown directly. Wiki and database tools track quality values.
Does Tainted Lost only get quality 4 items?
In devil deals and shops, yes — only quality 4 items appear as themselves. Treasure rooms and other sources still show all items normally for Tainted Lost.
What does Sacred Orb reroll?
Sacred Orb rerolls quality 0, 1, and 2 items from boss drops and shops into quality 3 or 4 items from the same pool. It does not reroll treasure room items.
Did Repentance+ change item quality?
Yes. Several items had quality adjustments and effect rebalances in Repentance+ patches. The tier list continues to evolve with each update.
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