Rune Bag

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(except in Rebirth)

Rune Bag is an unlockable passive item added in The Binding of Isaac: Afterbirth.

Effects

  • Spawns a familiar that drops a random rune after clearing enough rooms.
    • (except in Repentance and Repentance+) Runes are dropped alternating every 5 or 6 rooms.
    • (in Repentance and Repentance+) Runes are dropped alternating every 7 or 8 rooms.

Notes

  • (except in Repentance and Repentance+) If there are no runes unlocked, it will drop cards instead.
  • (in Repentance and Repentance+) Rune Bag will also drop Soul Stones if any have been unlocked.
  • (in Repentance and Repentance+) If less than 6 runes are unlocked, it can drop a Rune ShardRune Shard instead of a rune.
  • (in Repentance and Repentance+) Familiars that follow behind Isaac have a certain priority in how close their position is to him over other familiars, with Rune Bag having the lowest priority at (except in Repentance+) 6th / (in Repentance+) 8th and thus being farther from Isaac than familiars of different priorities.

Synergies

  • BFFS!BFFS!: The drop rate is improved to every 4-5 rooms.
    • (in Repentance and Repentance+) The drop rate is improved to every 6 rooms.

In-game Footage

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YouTube
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Trivia

This item is the rune counterpart to Bomb BagBomb Bag, Mystery SackMystery Sack, Sack of PenniesSack of Pennies, and (except in Rebirth and Afterbirth) Sack of SacksSack of Sacks.

Bugs

Bug Bug! If one half of (in Repentance and Repentance+) Character Tainted Lazarus icon.pngTainted Lazarus holds this item, the Rune Bag will always drop the same rune for the whole run.


Lilith Unlocks Lilith Unlocks Lilith Unlocks
(except in Rebirth)
IncubusBox of FriendsBig BabyRune BagCambion ConceptionSerpent's KissSuccubusImmaculate ConceptionGoat Head BabyDark Baby 		(except in Rebirth and Afterbirth)
EuthanasiaDuality 		(in Repentance and Repentance+)
Blood PuppyC SectionThe Harlot
Isaac (Boss) Unlocks Isaac (Boss) Unlocks Isaac (Boss) Unlocks

A CrossA Bag of PenniesThe D6Bloody LustThe PolaroidSomething IckyEve's Bird FootIsaac's TearsGuillotineLazarus' RagsBlank CardSatanic BibleIsaac's Heart 		(except in Rebirth)
Rune BagKeeper holds Wooden NickelPAY TO PLAYBRAINS! 		(except in Rebirth and Afterbirth)
PONGLocust of WrathSlipped Rib 		(in Repentance and Repentance+)
Book of VirtuesThe StairwayMom's LockHoly CrownGilded KeyYour SoulDingle BerryStrange KeyTemporary TattooWicked CrownTorn PocketNuh Uh!Kid's DrawingThe TwinsKeeper's BargainCricket LegPolished BoneExpansion PackRC Remote
SmallIsaac.pngThe Binding of Isaac: RebirthSmallIsaac.png
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