Rune Sword - The Binding of Isaac

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Rune Sword is an active item in Reverie, a mod for The Binding of Isaac.

On pickup Spawns a random rune.

On use Consumes the rune held by Isaac and inserts it inside the item to add a passive effect onto the sword. If Isaac does not hold a rune, a random rune is spawned instead.

Can insert up to 6 runes. Inserting a new rune while it's full will drop the first rune as a pickup.

Pressing the drop button will reorder the runes.

Rune Sword can be found in the following item pools:

Name	Weight
Treasure Room	1.0/1.0
Secret Room	1.0/1.0
Greed Treasure Room	1.0/1.0
Greed Secret Room	1.0/1.0

The following tags are applied to this item:

Id	Description
offensive	Can appear for Tainted Lost.
nocantrip	Not available as card effects during the Cantripped! challenge.

The following special synergies and interactions for Rune Sword have been documented.

Mod	Item	Synergy
---	Car Battery	Inserts the held rune and grants a random rune, or spawns 2 random runes if no runes are held.
---	Book of Virtues	Spawns a rune wisp upon inserting a rune, which drops a random rune when destroyed.
Reverie	Lost Memory	Character: Watatsuki no Yorihime
---	Ansuz	Reveals rooms within (3 × runeCount) distance in the map layout.
---	Dagaz	Grants immunity to curses. +2 Soul Hearts upon inserting.
---	Hagalaz	Grants rock tears akin to Terra.
---	Perthro	When Isaac's bomb hits an item, it rerolls it. The item has (25 + 40 × 0.125 × runeCount)% chance to disappear.
---	Ehwaz	Upon defeating the boss of every floor, spawns a trapdoor to the crawlspace.
---	Berkano	Upon cleaning a room, spawns (5 × runeCount) Blue Flies and (5 × runeCount) Blue Spiders.
---	Algiz	Upon taking damage, triggers the effect of Book of Shadows.
---	Jera	Upon entering a room, duplicates the pickups to (runeCount) times.
---	Black Rune	+0.2 speed. +0.5 fire rate. +1 flat damage. +1.5 range. +0.2 shotspeed. +1 luck.
---	Blank Rune	Inserts a random rune instead.
---	Rune Shard	Inserts a random rune instead.
---	Soul of Isaac	Upon entering a new room, triggers this rune's effect (runeCount) times.
---	Soul of Magdalene	Upon entering a room with enemies, triggers the rune's effect.
---	Soul of Cain	Upon cleaning a room, there is a 20% chance to trigger this rune's effect.
---	Soul of Judas	When Isaac is being hit by a projectile or enemy, triggers this rune's effect. Can trigger up to (3 × runeCount) times every room.
---	Soul of ???	Holding a fire button for 3 seconds will spawn a butt bomb.
---	Soul of Eve	Upon taking damage, spawns (5 × runeCount) dead birds in the room.
---	Soul of Samson	After Isaac deals (100 + 65 × currentFloor) damage, triggers the rune's effect.
---	Soul of Azazel	After clearing 4 rooms, upon entering a room with enemies, triggers the rune's effect.
---	Soul of Lazarus	When Isaac is killed, consumes the rune and revives him.
---	Soul of Eden	Upon inserting, spawns a random item from a random item pool.
---	Soul of the Lost	Upon inserting, activates Holy Card. Upon entering an unvisited room, has a (33 × runeCount)% chance to use Holy Card.
---	Soul of Lilith	Upon defeating the boss of every floor, triggers the rune's effect.
---	Soul of the Keeper	When an enemy is killed, it drops (runeCount) temporary coins.
---	Soul of Apollyon	Upon clearing a room, spawns (5 × runeCount) random locusts.
---	Soul of the Forgotten	Upon taking damage, has a (min(50, 25 × runeCount))% chance to spawn a Bone Heart.
---	Soul of Bethany	Upon cleaning a room, spawns (3 × runeCount) wisps.
---	Soul of Jacob and Esau	Upon inserting, spawns a clone of the passive item with the highest quality from Isaac's inventory.
Reverie	Soul of Eika	When an enemy is killed, it has a (min(20, 5 × runeCount))% chance to spawn a friendly Blood Bony.
Reverie	Soul of Satori	Tears have (50 × runeCount)% chance to turn enemies friendly.
Reverie	Soul of Seija	Grants Seija's passive effect. Inserting reversed Soul of Seija cancels the nerfs for high-quality items.
Reverie	Soul of Hourai	Activates the effect of this rune at the start of every floor.