As it removes all Red Heart Containers, other Deals with the Devil can be taken for "free" as long as Abaddon is taken last while still having at least 1 Container.
Can always be taken as a deal. Even if Isaac only has one or two Soul Hearts, the Black Hearts will be granted after taking the item.
Mom's Perfume: The chance to inflict fear does not stack.
Tainted Bethany: Does not remove stored Red Hearts nor converts them into Black Hearts.
In-game Footage[]
Trivia[]
In the Hebrew Bible, the name Abaddon is used as a reference to a bottomless pit, often appearing alongside the place of the dead (which is known as Sheol), meaning the land of the dead. The actual Hebrew word Abaddon (אבדון - pronounced avadon) means "doom".
In the New Testament'sBook of Revelation, an angel called Abaddon is written as the king of an army of locusts; his name is first transcribed in Greek (Revelation 9:11 – "whose name in Hebrew Abaddon").
Abaddon also shares its name with a level from Edmund's previous game Super Meat Boy.
Lil Abaddon resembles this item's costume and shares a similar name, but its effects are closer to Maw Of The Void.
Bugs[]
Bug!
If Keeper picks up Abaddon, it will remove all of his Coin Hearts but will not kill him until he picks up an item. This still applies if Abaddon is acquired via the Debug Console, but not if the item is picked up normally.