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Each level has a chance to include a Special Room where the player can face one of The Seven Deadly Sins. These are treated as Mini-Bosses and also have a chance to drop a collectible.

	Envy		Pride
	Gluttony		Sloth
	Greed		Wrath
	Lust

The Book Of SinEdit

Upon defeating all seven deadly sins, you unlock The Book Of Sin. (this does not have to be done in one playthrough).

NotesEdit

The health of the Sin you are facing varies, depending on the current floor you are at.

These enemies can appear in normal rooms of The Womb/Utero and onward but unlike regular bosses, they still drop items, pickups and sometimes treasures associated with them when they're defeated (if there are two of the same sins in the room, items spawn when the second one is defeated).
There are items that the player can collect through out the game, giving the player similar attacks and effects as the 7 Deadly Sins.(ex. Dr.Fetus=Wrath, The Virus=Lust, The Inner eye= Greed, Ect.) Some of these items can be dropped by rare occasion when the Sin is defeated.

The Seven Super Deadly SinsEdit

The "Super Deadly Sins" were added in the Wrath of the Lamb expansion and will sometimes appear instead of the regular version of the accordant Deadly Sin, including sins appearing outside miniboss rooms in later levels.

	Super Envy		Super Pride
	Super Gluttony		Super Sloth
	Super Greed		Super Wrath
	Super Lust

Ultra PrideEdit

The boss called Ultra Pride was added into the Wrath of the Lamb DLC in version 1.3. Upon defeating him, the achievement and item The Left Hand is unlocked.