Wikia

The Binding of Isaac Wiki

Devil Room

Talk21
431pages on
this wiki

Baphomet

Devil room door


The Devil Room is a special Room that has a chance to appear after defeating a boss; there are multiple factors that increase the chances of a Devil Room spawning, such as possessing a Pentagram, killing a Beggar, etc. The Devil Room may also be accessed via the Joker Suit Card, or randomly with Red Chests, which will cause Isaac to return to the starting room of the floor upon exit.

When in the room, two items from the Devil Room's Item Pool are shown, which can be bought with, depending on the item, 1 or 2 Heart Containers or occasionally Soul Hearts.

There is also a 10% chance that a special boss called Krampus will appear in the room upon entry once per playthrough. In this case, there will be no items available to purchase, he will drop A Lump Of Coal after the battle. This item can be re-rolled with The Dice into another item from the Devil Room Item Pool.

Under certain conditions, an Angel Room replaces the Devil Room.

NotesEdit

  • When playing as ???, all items will cost 3 Soul Hearts.
  • What If the player has no Soul Hearts and buys an item for exactly as many or more red heart containers than they currently have, Isaac will die.
  • If the player has Soul Hearts and buys an item for more red heart containers than they currently have, Isaac will lose all heart containers and Soul Hearts, and will die from a single hit until more Soul Hearts or heart containers are collected.
  • If the player has Soul Hearts and buys an item for exactly as many red heart containers as they currently have, Isaac will keep his Soul Hearts.
    • Without any heart containers, the gameplay functions exactly like ???, making red hearts and red heart-related items useless until more heart containers are obtained, along with other special effects such as Whore Of Babylon always being active.
    • Eternal Hearts are ignored when making deals, and they will remain when Isaac's health is set to 0.
  • Judas' Tongue sets the price of all Devil Room items to 1 heart container, but all soul heart deals will remain the same.
  • The Devil Room on The Womb 2 will always contain a trapdoor to Sheol instead of two items. This makes it possible to enter the level before unlocking It Lives!
  • Invincibility granting items such as Book Of Shadows will not make the items free of health costs, unless you are playing as ???, where items that grant invincibility will allow you to "steal" Devil Room items.  However, they will prevent Isaac from dying if he has no Soul Hearts.
  • Doing a deal with the devil counts as damage for the purpose of "No Damage" achievements.
  • If The Dice is used in the room, the items being sold can be re-rolled into other items from the pool, but the cost of Heart Containers will not change. This makes it possible to get items that cost 2 heart containers for 1 heart container only.
  • The Devil Room will not appear after beating the very first level in any case (Basement 1 or Cellar 1). However, it can still be accessed with The Joker Tarot Card.
  • If the very first level is an XL map (Basement XL or Cellar XL), the Devil Room may appear after beating the second boss.
  • Temporary health boosts such as those from the XI Strength Tarot Card or Liberty Cap will not reduce the number of heart containers lost from a deal. Going out of the room will remove the extra heart container, if any
  • If the player has a Judgement card and activates it inside the Devil Room, the Beggar will pay out an item from the Devil Room pool.

ProbabilitiesEdit

The basics: The Devil Room can spawn once you clear the level's Boss Room or reenter Boss Room After clear based on your accumulated probability. It cannot spawn in Sheol, although they can be accessed on those floors via the Joker card, or a red chest teleport. If you get a Devil Room in The Womb 2 after beating Mom's Heart (before you beat Mom's Heart for the tenth time), you won't get any deals, but a trap door leading to Sheol. If you have beaten Mom's Heart at least ten times, there will spawn a regular trap door in the Boss Room after beating Mom's Heart and you don't have to find the Devil Room in order to get to Sheol.

Base probability = 1%

Add the following percentages:

  • Have multiple Pentagrams: +30%
  • Killed 1 or more Beggars in current level: +35%
  • Took no red heart damage from the boss: +35%
  • Took no red heart damage in current level or Devil/Angel Room appeared the last time Isaac visited the boss room: +99%


Then multiply by one of these:

  • Devil/Angel Room spawned on the boss room in the current level or the level before: 0.25
  • Devil/Angel Room spawned on the boss room two levels ago: 0.5
  • The last Devil/Angel Room spawned on the boss room level number is not reset when you start a new run, so if Devil/Angel Room spawned on the boss room in one run and then you start a new run, it will reduce the chance with above two rule even you didn't meet Devil/Angel Room on the boss room before.
  • Floors on which Devil rooms do not naturally spawn (Basement 1, Sheol, The Cathedral, The Chest) do not count as floors in between Devil rooms; for example, if you earn a Devil room on Womb 2, die, and start a new run, the 0.25 multiplier does not change into a 0.5 multiplier after Basement 1. Even if you completed the Cathedral and the Chest after Womb 2, the 0.25 multiplier would not go away or turn into a 0.5 multiplier until Basement 2.

The shell game beggar in Arcade is also counted. Self-inflicted damage is not counted. (e.g. Razor Blade, Blood Rights, IV Bag, Bad Trip, Blood Donation Machine, Devil Beggar)

The strange/unimportant rules:

  • The room didn't appear once you killed the boss: probability = 0%

You cannot see a devil room if you defeat Mom in the Depths 2. But if you teleport out of the room (even using the Emperor tarot card), you may gain access to the devil room (if it had spawned), since the boss room layout changes to the normal one (no sealed exit).

Devil Room ItemsEdit

For the "cost" section of the following table, HP = Heart container. All items may also appear at the cost of 3 Soul Hearts per regular heart container instead of their normal cost.

Item Icon Effect Price
The Book Of Belial The Book Of Belial Icon

Adds 2 points of damage for the current room. Damage is further multiplied by 1.5x with the Blood Of The Martyr item. Also increases chances of a Devil Room spawning by 25%.

1 HP
The Book Of Sin The Book Of Sin Icon

Spawns a random Pick Up, Pill or Card.

1 HP

Brimstone

Brimstone Icon

Changes tears to a chargeable laser, which pierces all objects in its path. Also multiplies damage by 3.

It can only be fired after a short charge-up period.

2 HP

Brother Bobby

Brother Bobby Icon

Follows Isaac around shooting normal tears.

1-2 HP

The Common Cold

The Common Cold Icon

Gives Isaac's shot a chance of poisoning enemies for a 2.5 seconds, and turns tears green.

1 HP

Dead Cat

Dead Cat Icon

Your HP is set to 1.

You are followed by a floating cat head and have 9 lives (these still count as deaths on the statistics screen).

You can increase your max HP as normal, but after each death it will reset to 1 again.

2 HP

Demon Baby

Demon Baby Icon

Follows Isaac and automatically fires at enemies in its reach.

2 HP
Forget Me Now Forget Me Now Icon

When activated, the level ends and is freshly regenerated with new rooms, monsters, and items. Disappears after use.

1 HP

Lord Of The Pit

Lord Of The Pit Icon

Isaac can fly over all obstacles, including damage floors, spikes, rocks, and pits. Increases speed by 1.

2 HP

Lucky Foot

Lucky Foot Icon

All Pills picked up will have positive or neutral effects (same effect as the PHD, but without pill identification and neutral pills). Increases the chance of getting Pick Ups from clearing a room or from Poop and Fireplaces. Increases the chance of winning the Shell game in the Arcade room from 33% to roughly 50%. Increases the chances of getting items from Golden Chests.

1 HP

The Mark

The Mark Icon

Increases Damage by 1, Speed by 0.2, and adds one Soul Heart.

2 HP

Mom's Knife

Moms Knife Icon

Once collected, Isaac no longer shoots tears, he shoots a knife in boomerang style. The range of throw increases by charging the shot.

Can also be used as a melee weapon while not fired.

1 HP

Money = Power

Money Equals Power Icon

Increases damage based on the number of coins the player has at the moment.

1 HP
Monster Manuel Monster Manuel Icon

Summons a random familiar for the current room only, even if it is locked.

1 HP
The Nail The Nail Icon

Adds one Soul Heart and allows the breaking of Rocks and damaging enemies by simply walking over them.

Increases Damage by 0.7 and decreases Speed by 0.18.

2 HP
The Necronomicon The Necronomicon Icon

Damages all enemies in the room significantly.

1-2 HP

Ouija Board

Ouija Board Icon

Turns Isaac's tears spectral, allowing them to go through rocks or obstacles.

1 HP
The Pact The Pact Icon

Increases Damage by 0.5 and Rate Of Fire by 0.7. The player also gains 2 Soul Hearts.

2 HP

The Parasite

The Parasite Icon

Makes the Isaac's tears split in two when they hit something.

1-2 HP

A Quarter

A Quarter Icon

Gives you 25 pennies.

1 HP
Razor Blade Razor Blade Icon

Deals 1 Heart of damage to Isaac, which increases damage for the current room.

1 HP

Sister Maggy

Sister Maggy Icon

Follows Isaac around shooting blood tears.

1 HP

Technology

Technology Icon

Gives Isaac a laser shot with unlimited range.

Shots pierce enemies but not rocks, fire, or poop.

Shots can't be angled, and will not provide knockback.

1 HP
We Need To Go Deeper! We Need To Go Deeper Icon

Creates a trapdoor to go to the next floor. If used in The Womb, it will create a trapdoor to Sheol, even if the player hasn't unlocked it.
Does not work in Sheol, The Cathedral, or The Chest.

1 HP

Whore Of Babylon

Whore Of Babylon Icon

When Isaac reaches a half-heart, he is given +2.16 damage, and his speed increases by 0.3.

2 HP

Wrath of the Lamb DLCEdit

Item Icon Effect Price

Guppy's Head

Guppys Head Icon

Spawns 2-4 Blue Flies to damage enemies.

1-2 HP

Guppy's Paw

Guppys Paw Icon

Removes one Heart Container in exchange for gaining 3 Soul Hearts.

1-2 HP  

Bloody Lust

Bloody Lust Icon

Increases damage each time Isaac kills an enemy for the current room. (.28 damage per kill, caps at 3.3.)

2 HP

Guppy's Tail

Guppys Tail Icon

Increases chance of gold chests and normal chests.

1-2 HP

Spirit Of The Night

Spirit Of The Night Icon

Grants Isaac flight and spectral tears.

1-2 HP

BugsEdit

  • If you are playing as ??? with The Wafer, buying any item for Soul Hearts will only cost half a Soul Heart, instead of 3 Soul Hearts.
  • Any invincibility-granting item can allow you to buy items that cost Soul Hearts for free, as long as you have at least 3 Soul Hearts.
  • If you use momentum and grab both items while moving, it will take the heart container payment for both while only giving you the first Item.

GalleryEdit

Related AchievementsEdit

TheGiftFromKrampus"A Gift From Krampus" - Defeat Krampus in the Devil Room.
EvesDeadBird "Eve's Dead Bird" - Make two deals with the devil in one playthrough.

Rooms

Treasure room icon Treasure Room · Shop icon Shop · Secret room icon Secret Room · Arcade icon Arcade · BossRoomIcon Boss Room
Challegne room icon Challenge Room · Super secret room icon Devil Room · Super secret room icon I AM ERROR

Rooms in the Wrath of the Lamb

Curse room icon Curse Room · Sacrifice room icon Sacrifice Room · Super secret room icon Super Secret Room
Boss challenge room Boss Challenge Room · Libary icon Library · Angel room icon Angel Room

Start a Discussion Discussions about Devil Room

  • Can you survive with soul hearts only?

    6 messages
    • Had a devil room just now when I had three hearts [9 lives, +2 hearts gained]; The Pact and The Mark. Picked up both (since I was on the 9-li...
    • I just picked up brimstone while having 2 red hearts and 2 soul hearts and still ended up dying.  Very confused by this game mechanic.  >.<
  • Whore of Babylon + Devil room

    3 messages
    • Taking Dead Cat will ensure you are always at 1 heart, even bringing you back up from negative health
    • Nine Lives gives you the one heart container but it does not fill itself to a full heart since you did not have a full heart, and as you had s...

Around Wikia's network

Random Wiki