
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.
Runes are dropped alternating every 5 or 6 rooms.
Runes are dropped alternating every 7 or 8 rooms.
Notes[]
If there are no runes unlocked, it will drop cards instead.
Rune Bag will also drop Soul Stones if any have been unlocked.
If less than 6 runes are unlocked, it can drop a
Rune Shard instead of a rune.
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 6th and thus being farther from Isaac than familiars of different priorities.
Synergies[]
BFFS!: The drop rate is improved to every 4-5 rooms.
The drop rate is improved to every 6 rooms.
In-game Footage[]
Trivia[]
This item is the rune counterpart to Bomb Bag,
Mystery Sack,
Sack of Pennies, and
Sack of Sacks.
Bugs[]
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