Item Pool

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An item pool is the set of items that can be generated under a given circumstance. There are many item pools that exist within The Binding of Isaac: Rebirth.

Item Pool List

Game mode Name Usage Notes
Normal mode only Normal
Hard mode only Hard 		Treasure Room Items found in a Treasure RoomTreasure Room. All rooms not listed below use this pool for Item rolls, eg. Crawlspaces, (except in Rebirth and Afterbirth) Mystery GiftMystery Gift. This pool is drawn from if the default pool is empty.
Shop Items found in a ShopShop.
Library Items found in a LibraryLibrary. Contains all the book-themed items.
Curse Room Items found in a Curse RoomCurse Room. Contains many items with a risk-reward dynamic. Shares many items with Devil RoomDevil Room and Red Chest.pngRed Chest pools, but should not be confused
Boss Items found in a Boss RoomBoss Room or Boss Challenge RoomBoss Challenge Room. Contains only Passive Items. Some bosses and items can override the normal pool roll.
Secret Room Items found in a Secret RoomSecret Room.
Devil Room Items found in a Devil RoomDevil Room.
(in Repentance and Repentance+) Items given by a Hell Game.pngHell Game.
Angel Room Items found in an Angel RoomAngel Room.
Golden Chest Items contained in a Locked Chest.pngLocked Chest or Bomb Chest.pngBomb Chest.
Items found in a VaultVault. 		Significantly changed between different DLC versions. AB theme was all the heads, AB+ added all the bags, REP replaced the pool with household objects.
Red Chest Items contained in a Red Chest.pngRed Chest.
Beggar Items given by a Beggar.pngBeggar. Contains no Quality 3 or 4 items. Contains items themed on food, drugs, and coins.
Devil Beggar Items given by a Devil Beggar.pngDevil Beggar. All items in this pool are demonic, drugs, or connected to self-harm.
Key Master Items given by a Key Master.pngKey Master. All items in this pool are Keys or Flies.
(except in Rebirth) Bomb Bum Items given by a Bomb Bum.pngBomb Bum. All items in this pool are bombs.
(in Repentance and Repentance+) Planetarium Items found in a PlanetariumPlanetarium. Uniquely contains only items exclusive to this item pool.
(in Repentance and Repentance+) Ultra Secret Room Items found in an Ultra Secret RoomUltra Secret Room. All items in this pool are red, matching the theme of the Ultra Secret room.
(in Repentance and Repentance+) Crane Game Items given by a Crane Game.pngCrane Game.
(in Repentance and Repentance+) Shell Game Not normally used. Only used by Bag of CraftingBag of Crafting when collecting Character Tainted ??? icon.pngTainted ???'s poop pickups, and contains poop items.
(in Repentance and Repentance+) Rotten Beggar Items given by a Rotten Beggar.pngRotten Beggar. All items in this pool are Rotten.
(in Repentance and Repentance+) Battery Bum Items given by a Battery Bum.pngBattery Bum. All items in this pool are passive items connected to electricity.
(in Repentance and Repentance+) Old Chest Items contained in a Old Chest.pngOld Chest. All items in this pool are connected to Isaac's Mom or Dad.
(in Repentance and Repentance+) Wooden Chest Items contained in a Wooden Chest.pngWooden Chest. All items in this pool are made of wood.
(in Repentance and Repentance+) Mom's Chest Items contained in Mom's Chest.pngMom's Chest, or otherwise generated in Mom's Bedroom. Contains all of Mom's Items as well as Red KeyRed Key
(in Repentance and Repentance+) Baby Shop Items found in a ShopShop while holding Adoption PapersAdoption Papers. Contains all items that spawn a permanent familiar.
(except in Rebirth) Greed mode only Greed
(except in Rebirth and Afterbirth) Greedier mode only Greedier 		Treasure Room Items found in a Treasure RoomTreasure Room or ShopShop. All rooms not listed below use this pool for Item rolls, eg. Crawlspaces, (except in Rebirth and Afterbirth) Mystery GiftMystery Gift. This pool is drawn from if the default pool is empty.
Shop Items found in a ShopShop.
(except in Repentance and Repentance+) Library Items found in a LibraryLibrary-themed Super Secret RoomSuper Secret Room.
Curse Room Items found in a Curse RoomCurse Room.
Boss Items found in a Silver Treasure RoomTreasure Room or ShopShop.
Secret Room Items found in a Super Secret RoomSuper Secret Room.
Devil Room Items found in a Devil RoomDevil Room.
Angel Room Items found in an Angel RoomAngel Room.
(except in Repentance and Repentance+) Golden Chest Items contained in a Locked Chest.pngLocked Chest or Bomb Chest.pngBomb Chest.

Item Weight

Weight Decrementation

  • When you see an item spawn, the weight of that item is automatically decremented inside of the respective item pool. However, the amount of the decrementation varies depending on the specific item pool.
  • If an item happens to be in more than one item pool, the weight decrementation will also apply to other pools.
  • Touching an item will remove it from all item pools.
  • If a pedestal cycles between multiple items, such as from (in Repentance and Repentance+) Glitched CrownGlitched Crown, each item option will count as being seen.

The following item pools are decremented by 50% (0.5) on sight:

The following item pools are decremented by 40% (0.4) on sight:

The following item pools are decremented by 10% (0.1) on sight:

All other item pools not listed above are fully decremented on sight.

Examples

  • All items in the Treasure Room pool are completely decremented on sight. Thus, seeing a Notched AxeNotched Axe in the Basement 1 Treasure Room will make it impossible to spawn another Notched Axe in the run. (In this case, players do not have to touch the Notched Axe in order to prevent the game from ever spawning another one.)
  • (except in Repentance and Repentance+) All items in the shop pool are decremented by 0.5 on sight. Thus, if you use a Restock Machine to reroll a Treasure MapTreasure Map, you have a chance for another Treasure Map to appear. However, after the Treasure Map has already appeared twice on a run, it is completely decremented from the shop pool and it will never appear again.
    • (in Repentance and Repentance+) All items in the shop pool are fully decremented on sight. Thus, if you use a Restock Machine to reroll a Treasure MapTreasure Map, it will never appear again for the rest of the run.
  • If the player sees Telepathy For DummiesTelepathy For Dummies in the Basement 1 Treasure Room, it is completely removed from all other pools for the rest of the run even without touching it. Seeing it in a Library and not touching it, however, allows it still to be encountered as a Treasure item, with slightly lowered weight.

(except in Repentance and Repentance+) Unused Item Pools

In the itempools.xml file, we can see that there are some unused item pools:

Set Drops

The set drops are as follows:

From the Seven Deadly Sins:

From Bosses:

From Machines:

From Rocks:

From Shopkeeper.pngShopkeepers:

From Items and Trinkets:

From Rooms:

(in Repentance and Repentance+) From Boss Bumbino ingame.pngBumbino after he collects 12 cents:

(in Repentance and Repentance+) Chance from Boss Hornfel ingame.pngHornfel after defeating his 2nd phase before he escapes:

(except in Rebirth and Afterbirth) From sacrificing familiars with Sacrificial AltarSacrificial Altar

Notes

  • Item pools can be exhausted by having the game create every item in that specific pool. Items do not need to be picked up for this to happen, the game simply has to generate them (rerolling the item with The D6The D6 for example).
    • When an item pool is exhausted, the game will generate items from the Treasure Room pool instead.
    • If the Treasure Room pool is exhausted, the only item that can be generated from it is BreakfastBreakfast.
  • Even though you technically cannot see items during Curse of the Blind, their weights are still being reduced upon encountering them.
    • (in Repentance and Repentance+) The same applies to blind items in alternative chapters.


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