Birthright

Birthright is an unlockable passive item added in The Binding of Isaac: Repentance.

Effects[]

Grants a passive ability that varies from character to character. The effect typically enhances/magnifies the character's special traits or helps mitigate some of their downsides.

Character	Pickup Quote	Effect
Isaac	More options	All new item pedestals cycle between two options. Previously-seen items are unaffected.
Magdalene	Limit breaker + HP up	Adds 1 full red Heart Container. Increases the maximum heart limit to 18.
Cain	Better arcades + luck up	+1 Luck. All floors after Chapter 2, except for ???, Chest, Dark Room, The Void, and Home, will contain an upgraded Arcade that generally contains more Machines. This includes odd-numbered floors, Cathedral, and Sheol. Arcades will appear even if Cain is not holding at least 5 Coins. Greatly increases Lucky Foot's chances of winning effect. Arcades will still not spawn in Greed Mode.
Judas	Belial incarnate	The Book of Belial becomes a passive item that can be held beneath other active items, similar to Book of Virtues. May stack with Book of Virtues. If Judas is not currently holding The Book of Belial, he receives it. The damage boost received from The Book of Belial scales with the amount of charges the active item above it has; may not work with one-time-use items, items with unlimited use, timed recharges or items that do not follow normal room charge rules ( Isaac's Tears, etc). Has special interactions with certain items - see The Book of Belial for more information.
Dark Judas	Belial incarnate
???	Stronger spirit	Soul Hearts gained from HP ups are doubled.
Eve	Forever cursed	Whore of Babylon is active regardless of health and Dead Bird is active without taking damage.
Samson	Rage up	Bloody Lust can grant 4 more Damage boosts at +0.2 intervals, for a new maximum total of +14.0.
Azazel	Wide breath	Azazel's Brimstone beam becomes much wider like Mega Blast, with 2x larger collision area. No effect on damage.
Lazarus	Come back stronger	No direct effect. The item is triggered if Lazarus dies and becomes Lazarus Risen.
Lazarus Risen	Temporary DMG up	Grants a +21.6 Damage bonus that fades by 0.36 per second. Until the effect completely fades, killing an enemy restores 0.07 damage to the bonus.
Eden	???	Creates 3 random items from random item pools. Only one can be taken. Ignores item weight and can spawn items that have already been taken during the run. Can also spawn multiples of the same item, if they exist in multiple item pools.
The Lost	Better destiny	Prevents items with the `nolostbr` item tag from appearing. In practice, this automatically re-rolls most items that aren't beneficial to The Lost, namely ones that only give health, flight, and/or spectral tears or activate upon taking damage.
Lilith	Offensive Formation	Most familiars that normally follow Lilith, including Lilith's innate Incubus, will always be positioned in front of Lilith, creating a stack, facing whatever direction she was shooting. Non-attacking familiars ( The Relic, Farting Baby, etc.) will follow Lilith's most recently acquired attacking familiar instead; if the most recent familiar is throwable like Holy Water, familiars following it will also be launched with it. If Lilith has King Baby, it will always be positioned directly in front of Lilith with all other affected familiars forming a semi-circle around it, and will behave normally otherwise. Dry Baby is considered an "attacking familiar" and will be within the stack. Lil Portal and Jaw Bone are exempt and behave normally.
Keeper	Coin up	Adds one Coin Heart and raises Keeper's maximum Coin Heart limit to 4.
Apollyon	Regurgitate	Using Void has a chance to drop an item previously destroyed by it while keeping the bonus stats. Each item currently absorbed into Void can only be spawned once unless it is absorbed again after regurgitated. The more items absorbed into Void, the higher chance for an item to drop upon activation. Has no effect if Void is not held.
The Forgotten	Unchained	The Soul is unchained and free to move. It can move to different rooms, leaving The Forgotten behind, and switching back teleports The Soul back to The Forgotten.
Bethany	Conserve your faith	Activating an item using Soul Charges is free around 50% of the time.
Jacob and Esau	What's yours is mine	The character who picks up Birthright gains copies of the three most recent passive items from the other.
Tainted Isaac	Inventory up	Allows up to 12 passive items to be carried at a time. Does not consume a slot itself.
Tainted Magdalene	HP up!	Adds 1 full red Heart Container and increases the number of non-draining hearts to 3.
Tainted Cain	Salvage	The amount of pickups dropped from collecting an item is doubled.
Tainted Judas	Extended darkness	Increases the range in which Dark Arts hits enemies and tears.
Tainted ???	Poop up	Increases the maximum number of poop pickups that can be carried to 29.
Tainted Eve	Coagulate	Red Heart Clots now spawn temporary Half Red Hearts on death that last for two seconds before disappearing. Clots spawned from other types of hearts will not drop hearts.
Tainted Samson	Unstoppable force	The berserk timer gains 3 seconds instead of 1 when Tainted Samson kills an enemy.
Tainted Azazel	Stronger sneeze	Doubles the size of Tainted Azazel's Hemoptysis sneeze attack.
Tainted Lazarus	Superposition	The non-active form of Tainted Lazarus will appear in ghostly form, being completely immune to damage and dealing 25% damage (including tear effects such as Holy Light). Holding down the "drop" key allows the active form to move independently of the other form, similar to Jacob and Esau. Using Flip will cause the two characters to switch states while maintaining positions. Both characters receive the Birthright effect when one character collects it.
Dead Tainted Lazarus	Superposition
Tainted Eden	Eternal	Items gained before Birthright will not be re-rolled, either by taking damage or by items such as D4 and Missing No.. Items gained afterwards will still be affected.
Tainted Lost	Extra life	Grants an extra life that revives Tainted Lost in the same room and deals 200 damage to nearby enemies. It can hit the same enemy up to 4 times.
Tainted Lilith	Conjoined	Familiars that normally follow Tainted Lilith will instead act like and stack on top of her Gello familiar, disappearing inside of her while she's not firing and swinging out when she attacks. The melee attack gains a flat +3 damage bonus per familiar (regardless of damage multipliers) and if those familiars can shoot, they do so along with the Gello familiar. The Gello familiar gains the properties of King Baby, causing attached familiars to automatically aim and shoot at enemies. Familiars like Jaw Bone or Holy Water still function, but they are bound to the Gello familiar rather than their normal means of movement.
Tainted Keeper	Money money money	Strongly attracts the coins dropped by defeating enemies from a short distance. No effect on other coins.
Tainted Apollyon	Torment	Holding down the fire button causes Abyss locusts to continuously damage enemies instead of returning.
Tainted Forgotten	Recall	Tainted Soul is given Recall, an unlimited-use active item, which pulls Tainted Forgotten into his hands automatically from a distance.
Tainted Bethany	Artifact	Spawns four Lemegeton wisps of items with a quality of 3 or higher. These wisps are much larger and have much higher HP than normal wisps.
Tainted Jacob	It's not yours	Dark Esau splits into two. Both Esaus will always charge at the same time, and one will not charge if the other is not in position. Using Anima Sola chains both Dark Esaus at once and forces them together into one spot. Subsequent uses release each Dark Esau one at a time.

Notes[]

Birthright effects are stackable when playing as Tainted Lost, Tainted Bethany, or Tainted Magdalene. However, collecting additional Birthrights with Tainted Magdalene will simply add another bleeding heart container.
Playing as Magdalene, having more than 12 hearts, and entering the area in which Knife Piece 2 can be acquired will completely remove all hearts above 12.

Interactions[]

The following familiars are unaffected by Tainted Lilith's Birthright:

- All orbitals
- Damage-triggered familiars
- Bouncing familiars ( BBF, etc.)
- Wandering familiars ( Spider Mod, etc.)
- Mimicking familiars ( Papa Fly, etc.)
- All familiars spawned by active items
- Abel
- Angry Fly
- Blood Puppy
- Bumbo
- Bum Friend
- Daddy Longlegs
- Dark Bum
- Finger!
- Found Soul
- Fruity Plum
- Gemini
- Guppy's Hair Ball
- Isaac's Heart
- Key Bum
- Lil Gurdy
- Lil Haunt
- Lost Soul
- Pointy Rib
- Quints
- Robo-Baby 2.0
- Samson's Chains
- Star of Bethlehem
- Twisted Pair
- Worm Friend

Sacrificial Altar + Tainted Eve: Clots won't drop half red hearts after getting sacrificed.

In-game footage[]

Trivia[]

This item's name, description, and unlock requirement are likely a reference to the biblical story of Jacob and Esau, in which Esau trades his birthrights to Jacob in exchange for stew.
- When Tainted Jacob picks up Birthright, Dark Esau, a representation of his own rage, seemingly becomes only angrier and doubles in power.
  - Birthright's effect doubling Dark Esau's power, instead of Tainted Jacob's, further reflects the fact that it was originally his.
Prior to patch V1.7.6, Tainted Jacob's Birthright pickup quote was "There is no escape".
Tainted Keeper's pickup quote could be based off the song made by ABBA, "Money, Money, Money"
- The pickup quote could also be a refrence to Mr. Krabs, a character from the show, ¨Spongebob Squarepants¨, where Mr. Krabs often says, ¨Money, Money, Money.¨
Apollyon's Birthright could be a reference to Nuclear Throne. The character Robot has an Ultra Mutation of the same name which gives the character additional rewards after eating a gun.