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The Harbingers is the achievement that unlocks Famine, War, Pestilence, and Death as four additional bosses. The Harbingers are referenced in the Bible as the Four Horsemen of the Apocalypse. These bosses are only unlocked once Mom has been defeated for the first time. These bosses, with the exception of Conquest and The Headless Horseman, are guaranteed to drop either a Collectible Ball of Bandages iconBall of Bandages or a Collectible Cube of Meat iconCube of Meat. By default, there is a 10% chance the current floor's boss will be a Harbinger unless the floor has a fixed boss (for example, Mom in DepthsDepths and NecropolisNecropolis) or the Harbinger has been fought already. By using the Collectible Book of Revelations iconBook of Revelations on a floor, it is guaranteed that the boss will be a Harbinger.

Famine[ | ]

Famine is the Harbinger for Chapter 1.

Boss Famine

Pestilence[ | ]

Pestilence is the Harbinger for Chapter 2.

Boss Pestilence

War[ | ]

War is the Harbinger for Chapter 3. War cannot be found in DepthsDepths II, NecropolisNecropolis II, or (except in Rebirth)Dank DepthsDank Depths II as Mom will always be the boss of that floor.

Boss War

Death[ | ]

Death is the Harbinger for Chapter 4. Death cannot be found in WombWomb II, UteroUtero II, or (except in Rebirth)Scarred WombScarred Womb II as Mom's Heart or It Lives will always be the boss of that floor.

Boss Death

Conquest[ | ]

Conquest is an alternative boss to Death in Chapter 4. He is unlocked once 10 items have been taken from Angel Rooms. Conquest does not drop normal Horseman items, instead dropping Collectible White Pony iconWhite Pony.

Boss Conquest

The Headless Horseman[ | ]

The Headless Horseman can appear in the place of any Harbinger. Like Conquest, he doesn't drop normal Horseman items, instead dropping Collectible A Pony iconA Pony.

Boss The Headless Horseman

Unlockable Achievements[ | ]

Gallery[ | ]

Trivia[ | ]

  • Conquest was added in the Binding of Isaac: Wrath of the Lamb. In the Bible, Conquest is actually the first Horseman to appear, while Pestilence is a Horseman existing only in popular culture, coming from a different translation of the Greek word 'Thanatos', often meaning Death instead (the canon four Horsemen, thus, are Conquest, War, Famine and Death).
    • Conquest's entry in the secrets is called "The Forgotten Horseman", because of that very reason.
  • Death is the only horseman specifically given a name in The Book of Revelation.
  • The use of the Collectible Book of Revelations iconBook of Revelations item to summon a horseman for the current floor is reference to the fact that the book of the Bible in which the horsemen are described is Revelation.
  • None of the Harbingers have a death animation.
  • Under normal circumstances, Conquest and The Headless Horseman are 2 of only 5 bosses (the others being Krampus, The Fallen, and Baby Plum if spared) who drop or can drop active items upon defeat.
    • Bumbino can drop active items if paid 12 coins, but this does not defeat him in the traditional sense.
    • As for abnormal circumstances, the use of Filigree Feather allows the Angels to drop active items, and the use of Satanic Bible allows nearly any boss to drop an active item.
  • The horses used by the Harbingers resemble stick horses.


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