Damage
Attributes |
Health | Damage | Tears | Range | Shot Speed | Speed | Luck | Hidden Attributes |
Damage refers to the amount of damage each tear deals to enemies, and is represented by a sword. As damage increases, the size of the tears increases as well. However, tear size is not always a valid indication of how much damage your tears will do. Tears will grow and shrink when your damage changes, but tears of a certain size do not have a specific damage value, and two tears of the same size (in two different runs) are likely to have different damage values.
- Polyphemus is an example of an item that provides a very high Damage stat.
Contents
Effective Damage[edit | edit source]
The formula for damage is:
where:
- CharBaseDmg = The character's base damage multiplied by their multiplier,
- TotalDmgUps = the total of all regular damage ups collected (not including special exceptions or damage multipliers),
- FlatDmgUps = the total of all damage ups that are excluded from the above (for example,
Curved Horn or
Ipecac), and
- EffectiveDmg = the approximate damage that can be expected per tear, or per 'tick' when using
Brimstone or
Technology 2.
This formula makes most damage upgrades less potent the more that Isaac has. For example, a Pentagram on Isaac would make his total damage (1 * 1.2 + 1)^0.5 = 1.48 * 3.5 = 5.19. Another Pentagram increases this to 6.45 (a 1.26 increase instead of a 1.69 increase). The higher a character's base damage, the more effective damage ups will be for that character. Flat damage modifiers and special adjustments like Polyphemus or Sacred Heart happen after the main formula.
Character Modifier[edit | edit source]
The character base damage is defined by a base number and a multiplier.
- Eve†: 0.75 • 3.50 = 2.625
- Jacob: 1.00 * 2.75 = 2.75
- Isaac, Magdalene, Samson, Lazarus, Eden, Lilith, The Lost, Apollyon, The Soul, Bethany: 1.00 • 3.50 = 3.50
- ???: 1.05 • 3.50 = 3.675
- Esau: 1.00 * 3.75 = 3.75
- Keeper, Cain and Lazarus Risen: 1.20 • 3.50 = 4.20
- Judas: 1.35 • 3.50 = 4.725
- Azazel: 1.50 • 3.50 = 5.25
- The Forgotten: 1.50 • 3.50 = 5.25
- Dark Judas: 2 • 3.50 = 7.00
†: Whore of Babylon has the unique effect of increasing Eve's damage modifier from 0.75 to 1.00 when active. This does not apply to other characters, however.
Damage Multipliers[edit | edit source]
Some items multiply damage rather than simply adding to it. Damage multipliers do not simply multiply the character's damage once; the damage stat is constantly recalculated and the damage multipliers are multiplied with the end result. This means that if a character starts with 3.50 damage and gets a 2x multiplier, their effective damage will be 3.5*2 = 7.00. If an item that grants +1 damage is picked up, the character's effective damage will be 3.5*(1*1.2+1)^0.5*2 = 3.5*(2.2)^0.5*2 = 3.5*1.48*2 = 10.38, and not 7.00 + 1.
Most damage multipliers stack; for example, Proptosis and
Eve's Mascara both provide a 2x multiplier; picking up both will give a total multiplier of 4x. The exception to this is the 1.5x damage multipliers provided by
Cricket's Head,
Magic Mushroom, and the combination of
Blood of the Martyr and
The Book of Belial. These multipliers do not stack; for example, picking up both Cricket's Head and Magic Mushroom will result in an overall 1.5x multiplier rather than the expected 2.25x.
Reverse Formula[edit | edit source]
Consequently, the reverse formula to determine your damage bonuses from the displayed value is
Multipliers is the product of all the damage multipliers in effect, including the character base multiplier, equal to 1 if there are none.Items that affect damage[edit | edit source]
Activated Items[edit | edit source]
Name | ID | Icon | Quote | Description | ![]() |
---|---|---|---|---|---|
Razor Blade | 5.100.126 | ![]() |
Feel my pain | On use, takes one heart of health and grants +1.2 damage for the current room. | 0 |
The Book of Belial | 5.100.34 | ![]() |
Temporary DMG up | +2 damage for the current room. ![]() ![]() |
3 |
The Nail | 5.100.83 | ![]() |
Temporary demon form | Gives ![]() ![]() |
3 |
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5.100.406 | ![]() |
Reroll stats | Re-rolls Isaac's damage, tears, range, and speed. | 2 |
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5.100.481 | ![]() |
109 | Displaces enemy sprites for the current room, randomly increases one stat and decreases another. | 0 |
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5.100.487 | ![]() |
A pound of flesh | Removes a heart container, increases damage and range, and grants a Cube of Meat. | 3 |
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5.100.477 | ![]() |
Consume | Consumes all pedestal items in the room. Active items will have their effects added to Void, and passive items will grant stat upgrades. | 4 |
Passive Items[edit | edit source]
Name | ID | Icon | Quote | Description | ![]() |
---|---|---|---|---|---|
A Lump of Coal | 5.100.132 | ![]() |
My Xmas Present | The more distance tears travel, the more damage they will do. | 3 |
Abaddon | 5.100.230 | ![]() |
Evil + DMG up + fear shot | Grants +1.5 damage, +0.2 speed. Removes all Red Heart containers, grants six Black Hearts, and adds a chance to shoot fear tears. | 4 |
Blood Clot | 5.100.254 | ![]() |
DMG + range up | Tears fired from the left eye have +1 flat damage, +5 range, and +0.5 tear height. | 2 |
Blood of the Martyr | 5.100.7 | ![]() |
DMG up | Increases Damage by 1, and turns Isaac's tears into blood tears. | 3 |
Bloody Lust | 5.100.157 | ![]() |
RAGE! | Increases Isaac's damage whenever he takes damage, up to six times. The bonus resets when entering a new floor. | 3 |
Capricorn | 5.100.307 | ![]() |
All stats up | Increases health, damage, speed, and range, lowers tear delay, and gives one coin, bomb, and key. | 3 |
Cat-O-Nine-Tails | 5.100.165 | ![]() |
Shot speed + damage up | +1 damage, +0.23 shot speed. | 3 |
Ceremonial Robes | 5.100.216 | ![]() |
Sin up | Grants 3 Black Hearts, and +1 damage. | 3 |
Champion Belt | 5.100.208 | ![]() |
DMG + Challenge Up | Increases damage, but also increases the chance of champion enemies appearing. | 3 |
Chemical Peel | 5.100.154 | ![]() |
DMG up | Tears fired from the left eye have +2 flat damage. | 1 |
Cricket's Head | 5.100.4 | ![]() |
DMG up | Increases damage by 0.5, and multiplies it by 1.5x. | 4 |
Dark Matter | 5.100.259 | ![]() |
Fear shot | +1 damage, adds a chance to shoot fear tears. | 3 |
Death's Touch | 5.100.237 | ![]() |
Penetrative shot + damage up | +1.5 damage, -0.3 tears. Tears are replaced with large piercing scythes. | 3 |
Eve's Mascara | 5.100.310 | ![]() |
Shot speed down + DMG up | Doubles damage, halves tears stat, and greatly reduces shot speed. | 1 |
Experimental Treatment | 5.100.240 | ![]() |
Some stats up, some stats down | Randomly increases and decreases some of the character's stats. | 1 |
Godhead | 5.100.331 | ![]() |
God tears | Grants homing tears with a damaging halo. +0.5 damage, -0.3 tears, +1.2 range, -0.3 shot speed, +0.8 tear height. | 4 |
Growth Hormones | 5.100.70 | ![]() |
Speed + DMG up | +1 damage, +0.4 speed. | 3 |
Guillotine | 5.100.206 | ![]() |
An out-of-body experience | Isaac's head is removed from his body and floats around him as an orbital. Gives +1 damage and grants -1 tear delay. | 3 |
Ipecac | 5.100.149 | ![]() |
Explosive shots | Replaces tears with explosive and poisoning projectiles fired in an arc from the mouth. | 4 |
Iron Bar | 5.100.201 | ![]() |
Concussive tears | Increases damage by 0.3 and adds a chance to shoot concussive tears, causing enemies to walk around randomly. | 3 |
Jesus Juice | 5.100.197 | ![]() |
Damage + range up | +0.5 damage, +0.25 range, +0.5 tear height. | 2 |
Libra | 5.100.304 | ![]() |
You Feel Balanced | Gives 6 coins, 6 bombs, and 6 keys and balances out all attributes. | 1 |
Magic Mushroom | 5.100.12 | ![]() |
All Stats Up! | Makes Isaac bigger. Adds one Red Heart container, +0.3 damage, x1.5 damage multiplier, +5.25 range, and +0.3 speed. Restores all health on pickup. | 4 |
MEAT! | 5.100.193 | ![]() |
DMG + HP up | Grants one full Red Heart container, +0.3 damage. | 2 |
Missing No. | 5.100.258 | ![]() |
Syntax error | Randomizes all passive items and stats upon pickup and at the start of each succeeding floor. | 2 |
Odd Mushroom | 5.100.121 | ![]() |
DMG + HP up, Speed down. | Grants one empty Heart container, +0.3 damage, +0.25 range, +0.5 tear height, and -0.1 speed. | 2 |
Odd Mushroom | 5.100.120 | ![]() |
Fire rate up | +1.7 tears, +0.3 speed, slightly reduces damage. | 3 |
Pentagram | 5.100.51 | ![]() |
DMG up | +1 damage, increases Devil Room / Angel Room chance by 10%. | 3 |
Polyphemus | 5.100.169 | ![]() |
Mega Tears | Isaac fires huge tears that deal massive damage but fire rate is greatly decreased. If a tear kills an enemy, the tear travels on with any leftover damage. | 4 |
Proptosis | 5.100.261 | ![]() |
Short range mega tears | Tears start out massive with high damage, and then shrink down and become weaker over a short range. | 4 |
Sacred Heart | 5.100.182 | ![]() |
Homing shots + DMG up | Grants homing tears, x2.3 damage multiplier, +1 flat damage, +4.125 range, +0.75 tear height, -0.4 tears, -0.25 shot speed, a red Heart Container and replenishes all Red Hearts. | 4 |
SMB Super Fan | 5.100.189 | ![]() |
All stats up | +1 Red Heart container, +0.3 damage, +0.2 tears, +0.2 speed, +0.5 range, +1 tear height. Fully restores all red hearts. | 3 |
Soy Milk | 5.100.330 | ![]() |
DMG Down + Tears Way Up | Tears are smaller and do much less damage, but fire in very rapid succession. | 2 |
Steven | 5.100.50 | ![]() |
DMG up | Increases damage by 1. | 3 |
Stigmata | 5.100.138 | ![]() |
DMG + HP up | Increases damage, and adds 1 heart container. | 2 |
Synthoil | 5.100.345 | ![]() |
DMG up + range | +1 damage, +5.25 range, +0.5 tear height. | 3 |
Technology 2 | 5.100.152 | ![]() |
Laser | Decreases damage and replaces right eye tears with a unlimited range, piercing laser which fires continuously. | 2 |
The Halo | 5.100.101 | ![]() |
All stats up | Grants one full Red Heart container, +0.3 damage, +0.2 tears, +0.25 range, +0.3 speed, and +0.5 tear height. | 2 |
The Mark | 5.100.79 | ![]() |
DMG + speed up | Grants one Soul Heart, +1 damage, and +0.2 speed. | 3 |
The Pact | 5.100.80 | ![]() |
DMG + Tears UP | Grants two Soul Hearts, +0.5 damage, and +0.7 tears. | 3 |
The Small Rock | 5.100.90 | ![]() |
DMG up | Increases damage by 1, increases tears by 0.2, and decreases speed by 0.2. | 3 |
Whore of Babylon | 5.100.122 | ![]() |
Curse up | Grants +1.5 damage and +0.3 speed whenever Isaac has half a red heart or less (one red heart for Eve), ignoring any Soul or Black Hearts. | 2 |
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5.100.359 | ![]() |
Stick it to 'em! | +1.5 Damage Up. Replaces Isaac's tears with nails, which have increased knockback. | 3 |
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5.100.415 | ![]() |
The untainted gain power | +2 soul hearts. While Isaac has no empty red hearts, grants 2x damage, +5.25 range, and -0.3 shot speed. Regardless of health, the crown deactivates for the current room when Isaac takes damage. | 4 |
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5.100.373 | ![]() |
Accuracy brings power! | Isaac's damage increases each time an enemy is hit. Damage is reset upon missing a shot. | 3 |
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5.100.411 | ![]() |
Their blood brings rage! | Isaac's damage increases for the current room each time he kills an enemy. | 3 |
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5.100.399 | ![]() |
Consume thy enemy! | Charged by firing for 2.5 seconds and when released, creates a black ring around Isaac that rapidly deals damage. ![]() |
4 |
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5.100.407 | ![]() |
Aura stat boost | Boosts one of Isaac's stats depending on the color of the aura around him. The aura disappears upon taking damage and reappears with a random color upon entering a new room. Red boosts damage, blue boosts tears, yellow boosts speed, and orange boosts range. | 2 |
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5.100.493 | ![]() |
Panic = power | Increases damage based on how many empty Red Heart containers Isaac has. | 1 |
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5.100.513 | ![]() |
Party time! | Increases damage by a flat 0.1 and grants a Soul Heart. Enemies can randomly become briefly charmed or feared. Taking damage has a chance to spawn a rainbow poop. | 2 |
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5.100.530 | ![]() |
Just hope you're not next... | Grants a pickup or stat upgrade if all enemies in a room are killed in the order they are marked. | 2 |
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5.100.445 | ![]() |
Bark at the moon! | +0.3 damage, +0.1 speed. Plays a howl or bark sound when entering a room with undiscovered Secret Rooms or Crawl Spaces. | 1 |
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5.100.531 | ![]() |
I'm seeing red... | Tears are now fired in an arc. Upon hitting the floor, an obstacle, or an enemy, they burst into many smaller tears in all directions. Increases tear delay. | 2 |
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5.100.463 | ![]() |
Acid tears! | +0.3 damage. Adds a chance to fire acidic tears which can destroy obstacles. | 2 |
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5.100.533 | ![]() |
Smite thy enemy | Damage down. Tears are replaced with piercing white blasts of light that can damage the same enemy multiple times. | 2 |
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5.100.633 | ![]() |
Ascended | Grants flight, +0.1 speed, +2 damage, and the ![]() |
0 |
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5.100.573 | ![]() |
Halo of tears | Adds one red heart container and fully restores health. x1.2 damage multiplier. Isaac will occasionally fire extra tears that orbit around him. | 3 |
Trinkets[edit | edit source]
Name | ID | Icon | Quote | Description |
---|---|---|---|---|
Curved Horn | 5.350.35 | ![]() |
DMG up | Increases damage by 2. |
Red Patch | 5.350.40 | ![]() |
Your rage grows | Grants a chance of increasing damage by 1.8 for the current room upon taking damage. |
Samson's Lock | 5.350.58 | ![]() |
Your rage grows | 1/15 chance to increase damage by 0.5 for the current room each time an enemy dies. |
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5.350.80 | ![]() |
With darkness comes power | Increases Isaac's damage for possessing certain evil items. |
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5.350.92 | ![]() |
Stat booster | ![]() ![]() |
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5.350.101 | ![]() |
I think it's broken | Provides a boost to all stats when Isaac's active item is completely uncharged. |
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5.350.100 | ![]() |
It needs power | Provides a boost to all stats when Isaac's active item is fully charged. |
Other[edit | edit source]
In co-op, Rage Baby, Revenge Baby, and Belial Baby will occasionally briefly increase damage. Dark Baby will occasionally briefly increase all stats, including damage. Buddy Baby will occasionally briefly grant the
Guillotine effect, which increases damage. Whore Baby will occasionally briefly grant the Whore of Babylon effect, which increases damage.
III - The Empress activates the
Whore of Babylon effect for the current room, which increases damage.
XI - Strength activates the
Magic Mushroom effect for the current room, which increases damage.
XV - The Devil activates
The Book of Belial effect for the current room, which increases damage.
Black Rune consumes all pedestal items in the room and turns them into random stat upgrades. No effect on shop items.
Huge Growth increases damage, range, and Isaac's size for the current room.
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