Vanishing Twin#697

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

• A Vanishing Twin is a fetus that dies during gestation and is reabsorbed by its twin, hence the appearance of the item.
• The familiar's flat appearance is due to a real life phenomenon known as fetus papyracaeus, where instead of a vanishing twin being physically reabsorbed by the other, the body stays in the womb and gets crushed and flattened by the healthy twin in full term between the fetus' expanding membranes and the uterine walls.
• When encountering C.H.A.D., the original will notably shrink once its clone spawns, due to Vanishing Twin reducing its HP and C.H.A.D.'s HP being linked to its size.
• Vanishing Twin used to not have the "lazarussharedglobal" tag with the lack thereof causing bugs. These bugs would occur when Tainted Lazarus used Flip. If Flip was used after the boss was cloned, it would not drop an additional item. If Flip was used after defeating the boss and gaining the item, it would spawn another item of the current pool on the next flip.

Bug! Some familiars like Headless Baby will follow the other boss as if it was a familiar.

• After beating the boss, familiars that were after Vanishing Twin will get bugged and stay at the entrance of every room instead of following the player. Bug! Using IV - The Emperor while in a boss fight will immediately kill the twin boss and spawn the second item for free; the player will only have to fight one boss thereafter. Bug! In Double Trouble boss fights, only one of the bosses will get copied, but both of them will get their health lowered down to 75%. Bug! The interaction between this item and Great Gideon is unstable — attempting to kill a clone of Great Gideon with Chaos Card will sometimes fail and cause a softlock. Bug! When cloning Turdlet, Vanishing Twin will only clone 1 segment of the boss and will stick to it, making a 6-segments Turdlet. Jacob and Esau Unlocks Hush Unlocks The Binding of Isaac: Rebirth
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