Binding of Isaac: Rebirth Wiki
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Tear Falling Speed[ | ]

Tear falling speed is a hidden attribute that determines how far above the ground tears travel after traveling for a short period of time, and in practice increases effective range. Very high tear falling speed makes Isaac's tears arc upward then continue along "cruising altitude" so high they can cross over obstacles as if they were spectral, but they won't go through the room walls. Once the tears fall down, they will start hitting obstacles again. This compounds with the height from the tear height stat.

  • (in Repentance) Items no longer give tear falling speed directly, instead tear falling speed is dynamically generated based on the range stat, shot speed stat, and tear height stat, in order to match the range stat in tiles.


(except in Repentance) Items that Affect Tear Falling Speed[ | ]

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Blood Clot 5.100.254 Blood Clot DMG + range up (except in Repentance)Tears fired from the left eye have +1 flat damage, +5 range, and +0.5 tear falling speed.
(in Repentance)Tears fired from the left eye have +1 flat damage and +2.75 range.
2
Dead Onion 5.100.336 Dead Onion Toxic aura tears Grants piercing and spectral tears. Increases tear size (without increasing damage) while greatly reducing range and shot speed. 3
Godhead 5.100.331 Godhead God tears (except in Repentance) Grants homing tears with a damaging halo. +0.5 Damage, -0.3 Tears -0.3 Shot Speed, +0.8 Tear Falling Speed, and +1.2 Range.
(in Repentance) Grants homing tears with a damaging halo. +0.5 Damage, -0.3 Tears, and -0.3 Shot Speed.
4
Ipecac 5.100.149 Ipecac Explosive shots Replaces tears with explosive and poisoning projectiles fired in an arc from the mouth. 4
Jesus Juice 5.100.197 Jesus Juice Damage + range up (except in Repentance) +0.5 damage, +0.25 range, +0.5 tear falling speed.
(in Repentance) +0.5 damage, +1.5 range.
2
Magic Mushroom 5.100.12 Magic Mushroom All stats up! (except in Repentance) Makes Isaac bigger. Adds one Red Heart Container, +0.3 Damage, x1.5 damage multiplier, +5.25 Range, +0.3 Speed, and restores all Health.
(in Repentance) Makes Isaac bigger. Adds one Red Heart Container, +0.3 Damage, x1.5 damage multiplier, +2.5 Range, +0.3 Speed, and restores all Health.
4
Mini Mush 5.100.71 Mini Mush Speed + range up Decreases Isaac's size, making him less likely to be hit. (except in Repentance)+0.3 speed, +1.5 tear falling speed, -4.25 range (effective range is increased). (in Repentance) +0.3 speed, +2.5 range. 2
Mom's Contacts 5.100.110 Mom's Contacts Freeze effect Adds a chance to shoot petrifying tears, which stop enemies in place and prevent them from moving or attacking. (except in Repentance) +0.25 range. (in Repentance) +1.5 range. 3
Mom's Heels 5.100.30 Mom's Heels Range up (except in Repentance) +5.25 range, +0.5 tear falling speed.
(in Repentance) +2.5 range, enemies that touch Isaac take 12 damage.
1
Mom's Lipstick 5.100.31 Mom's Lipstick Range up (except in Repentance)+5.25 range, +0.5 tear falling speed.
(in Repentance) +3.75 range. Spawns a Red HeartHeart on pickup.
1
Mom's Underwear 5.100.29 Mom's Underwear Range up (except in Repentance) +5.25 range, +0.5 tear falling speed.
(in Repentance) +2.5 range. Spawns 3-6 Blue Flies on pickup.
1
My Reflection 5.100.5 My Reflection Boomerang tears + DMG up + luck down Gives Isaac's tears a boomerang effect. (except in Repentance) +1.5 range, +1 tear falling speed, x1.6 shot speed multiplier. (in Repentance) 2x + 1.5 range, +1.5 damage, -1 luck, 1.6x shot speed multiplier. 2
Number One 5.100.6 Number One Tears up + range down Grants +1.5 tears, but severely reduces range. 2
Odd Mushroom 5.100.121 Odd Mushroom HP + DMG up, speed down (except in Repentance) Grants one empty Heart container, +0.3 damage, +0.25 range, +0.5 tear falling speed, and -0.1 speed.
(in Repentance) Grants one full Heart container, +1 damage, +1.5 range, and -0.2 speed
2
Roid Rage 5.100.14 Roid Rage Speed and range up (except in Repentance) +0.6 speed, +5.25 range, +0.5 tear falling speed.
(in Repentance) +0.3 speed, +2.5 range
2
Sacred Heart 5.100.182 Sacred Heart Homing shots + DMG up (except in Repentance) Adds a Red Heart Container. Grants homing tears, a x2.3 Damage multiplier, +1 flat Damage, -0.4 Tears, -0.25 Shot Speed, and +4.125 Range.
(in Repentance) Adds a Red Heart Container. Grants homing tears, a x2.3 Damage multiplier, +1 flat Damage, -0.4 Tears, and -0.25 Shot Speed.
4
Safety Pin 5.100.339 Safety Pin Evil + range + shot speed up (except in Repentance) Grants one Black HeartBlack Heart, +5.25 range, +0.5 tear falling speed, +0.16 shot speed.
(in Repentance) Grants one Black HeartBlack Heart, +2.5 range, +0.16 shot speed.
1
SMB Super Fan 5.100.189 SMB Super Fan All stats up (except in Repentance) +1 Red Heart container, +0.3 damage, +0.2 tears, +0.2 speed, +0.5 range, +1 tear falling speed. Fully restores all red hearts.
(in Repentance) +1 Red Heart container, +0.3 damage, +0.2 tears, +0.2 speed, +2.5 range. Fully restores all red hearts.
3
Synthoil 5.100.345 Synthoil DMG + range up (except in Repentance) +1 damage, +5.25 range, +0.5 tear falling speed.
(in Repentance) +1 damage, +2.5 range.
3
The Halo 5.100.101 The Halo All stats up (except in Repentance) Grants one full Red Heart container, +0.3 damage, +0.2 tears, +0.25 range, +0.3 speed, and +0.5 tear falling speed.
(in Repentance) Grants one full Red Heart container, +0.3 damage, +0.2 tears, +1.5 range, and +0.3 speed. Heals 1 additional Red HeartRed Heart.
2
Tiny Planet 5.100.233 Tiny Planet Orbiting tears + range up Massively increases Range and grants spectral tears. Tears orbit around Isaac at a fixed distance until they hit the ground. 0
(except in Rebirth) Continuum 5.100.369 Continuum Transcendent tears Grants spectral tears and increases range. Tears travel through walls and appear at the opposite side of the room. 2
(except in Rebirth) Crown Of Light 5.100.415 Crown Of Light The untainted gain power +2 Soul HeartSoul Hearts. While Isaac has no empty red hearts, grants 2x damage, increased range, and -0.3 shot speed. Regardless of health, the crown deactivates for the current room when Isaac takes damage. 4
(except in Rebirth) Kidney Stone 5.100.440 Kidney Stone Matt's kidney stone Randomly while firing tears, Isaac will stop firing and turn red, where he will charge and release a lot of 'tears' in one go. The burst of tears also includes a kidney stone, which deals a lot of damage. 2
(except in Rebirth) Marked 5.100.394 Marked Directed tears Isaac will automatically fire tears directed at a red target on the ground. The target can be moved with tear controls. +0.7 tears, increases range. 1
(except in Rebirth) Mom's Pearls 5.100.355 Mom's Pearls Range + luck up (except in Repentance) +1.25 range, +0.5 tear falling speed, +1 luck.
(in Repentance) +2.5 range, +1 luck. Grants one Soul HeartSoul Heart.
2
(except in Rebirth) Mr. Dolly 5.100.370 Mr Range + tears up (except in Repentance) +0.7 tears, +5.25 range, +0.5 tear falling speed, Spawns a combination of 3 Red HeartRed Hearts, Soul HeartSoul Hearts or Black HeartBlack Hearts on the floor when picked up.
(in Repentance) +0.7 tears, +2.5 range, spawns 3 random types of Red HeartHearts on the floor when picked up.
3
(except in Rebirth) Purity 5.100.407 Purity 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. 3
(except in Rebirth) Tractor Beam 5.100.397 Tractor Beam Controlled tears Isaac's tears are bound to a beam emitting in the direction he's firing. (except in Repentance) +0.5 Tears, +5.25 Range, +0.16 Shot Speed. (in Repentance) +1 Fire Rate, +2.5 Range, +0.16 Shot Speed. 3
(in Afterbirth † and Repentance) Compound Fracture 5.100.453 Compound Fracture Bone tears! Increases Range. Tears turn into bones, which shatter into 1-3 bone shards upon hitting an enemy or obstacle. 3
(in Afterbirth † and Repentance) Dad's Lost Coin 5.100.455 Dad's Lost Coin I remember this... (except in Repentance)+1.5 range, +1 tear falling speed. Drops a Lucky Penny.
(in Repentance)+2.5 range. Drops a Lucky Penny.
1
(in Afterbirth † and Repentance) Dark Prince's Crown 5.100.442 Dark Prince's Crown Loss is power (except in Repentance) When at exactly one Red HeartRed Heart, +0.75 tears, +1.5 range, and +0.2 shot speed.
(in Repentance) When at exactly one Red HeartRed Heart, +2 fire rate, +1.5 range, and +0.2 shot speed.
1
(in Afterbirth † and Repentance) Eye of Belial 5.100.462 Eye of Belial Possessed tears! Grants piercing tears. After piercing one enemy, tears start homing and deal double damage. 3

Trinkets[ | ]

Name ID Icon Quote Description
(except in Rebirth) Lazy Worm 5.350.66 Lazy Worm Pft Decreases shot speed by 0.5. (except in Repentance) Increases range by 4.
(except in Rebirth) Tape Worm 5.350.65 Tape Worm Floooooooooop! (except in Repentance) Doubles Isaac's range and halves his tear falling speed.
(in Repentance) +3 range.
(in Afterbirth † and Repentance) Dim Bulb 5.350.101 Dim Bulb I think it's broken Provides a boost to all stats when Isaac's active item is completely uncharged.
(in Afterbirth † and Repentance) Ouroboros Worm 5.350.96 Ouroboros Worm Foop foop! Tears travel in a large spiral pattern and gain spectral, with a small chance to gain homing. (in Repentance) Also adds +0.4 Tears.
(in Afterbirth † and Repentance) Vibrant Bulb 5.350.100 Vibrant Bulb It needs power Provides a boost to all stats when Isaac's active item is fully charged.

Other[ | ]

  • (except in Rebirth) In co-op, Long Baby will occasionally briefly increase range, shot speed, and tear falling speed. Dark Baby will occasionally briefly increase all stats, including tear falling speed.
  • (except in Repentance) Character Azazel iconAzazel starts with -1 tear falling speed, though the stat does not affect his short-range Brimstone.


(in Repentance) Tear Height[ | ]

Tear height is a hidden attribute that determines the height that tears spawn at. Before Repentance, this was the range stat displayed in the found hud, and most items that affected range affected this stat directly. Since Repentance, most range affecting items affect the new range stat instead of tear height, and only a few items affect tear height directly. Tear height no longer majorly affects effective range.

Items that Affect Tear Height[ | ]

Item Tear Height Adjustment
Base tear height 23.75
Collectible Eye of the Occult iconEye of the Occult +8
Collectible Jupiter iconJupiter +8
Collectible Pluto iconPluto/Collectible Inner Child iconInner Child's revive x0.4
Huge GrowthHuge Growth +30
Collectible Mega Mush iconMega Mush +80
Tape WormTape Worm x2 per Tape Worm
Collectible Telepathy For Dummies iconTelepathy For Dummies/I - The MagicianI - The Magician x2
Collectible Number One iconNumber One/Collectible Kidney Stone iconKidney Stone -18
Collectible Multidimensional Baby iconMultidimensional Baby x1.5
Collectible Parasitoid iconParasitoid's egg tears x2

Notes[ | ]

Knockback[ | ]

Knockback is a mechanic that determines how far an entity is pushed back by a certain force.

Tear Knockback[ | ]

This knockback comes from Tears, most notably Isaac's. The knockback force is determined by the speed and direction of the tear, which itself is determined by Isaac's movement and Shot Speed. For example, Ring WormRing Worm does not increase the knockback stat, but does affect knockback as the tear's speed hits extremes of very fast and very slow; hitting enemies with the fastest moment of its arc applies significant knockback. Damage does not affect the knockback.

Upon collision, the tear applies two separate knockbacks on the enemy. One is collision knockback which pushes the enemy away from the tear. The other one is momentum knockback which pushes the enemy toward the tear's movement direction. Since they can have directional difference, the two knockbacks can cancel each other in some rare cases.

Where:

  • Vp is the tear's velocity.
  • K is knockback multiplier, which is 1.7 by default but is counted as 0 when the knockback multiplier is not active.
  • Mp is the tear's mass, which is 8 by default.
  • Mt is the enemy's mass.

Knockbacks from laser is:

The knockback multiplier does not affect lasers' knockback.

Knockback items affect the knockback in many ways, by activating the knockback multiplier, increasing the knockback multiplier, and/or increasing the tear mass. Effects that increase the knockback multiplier do not stack, and only the highest increase applies. Effects that increase the tear mass do not stack. Collectible Soy Milk iconSoy Milk or (in Repentance)Collectible Almond Milk iconAlmond Milk decrease the tear mass, thus weakening the knockback.

Items that Affect Tear Knockback[ | ]

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Pisces 5.100.309 Pisces Tears up + knock-back shots (except in Repentance) -1 Tear Delay, adds knock-back shots and increases tear size.
(in Repentance) +0.5 Fire Rate, adds knock-back shots and increases tear size.
2
Soy Milk 5.100.330 Soy Milk DMG down + tears way up Tears are smaller and do much less damage, but fire in very rapid succession. 2
(except in Rebirth) 8 Inch Nails 5.100.359 8 Inch Nails Stick it to 'em! +1.5 damage. Replaces Isaac's tears with nails, which have increased knockback. 3
(in Repentance) Almond Milk 5.100.561 Almond Milk DMG down + tears up + you feel nutty Quadruples fire rate, with x0.3 damage multiplier. Each tear is a given random effect that alters its movement. 1
(in Repentance) Terra 5.100.592 Terra Born to rock +1 Damage. Replaces tears with rocks that deal variable damage, have increased knockback, and can destroy obstacles. 3

Trinkets[ | ]

Name ID Icon Quote Description
(except in Rebirth) Blister 5.350.77 Blister Bounce back! Increases knockback of tears.

Notes[ | ]

  • Directional knockback affects most enemies, including bosses (except for stationary ones like Pin or Round Worm). Items (both trinkets and pickups) cannot be moved by tears, except for live bombs.
  • Knockback from tears provides minor crowd control for homing enemies like flies or Gapers, increasing the time it takes them to reach Isaac.
  • Be wary of the natural knockback from tears when trying to dodge charging enemies (like the smaller twin of Gemini, Gurglings, and Leeches): The tears can push them off-track and towards the direction you are planning to escape to.

Knockback from other sources[ | ]

Various sources also can cause knockback. This knockback is often a little shockwave that's emitted at a certain radius in all directions, most prominently from explosives, like Bombs. Certain farts also create a knockback. Some enemies, like the Fatty, can fart, and Isaac can also do so with certain items.

Pickups (including chests) are affected by this knockback; items, however, are not.

(in Repentance)Knockbacks from Collectible Belly Jelly iconBelly Jelly, Collectible Butter Bean iconButter Bean, Collectible Divine Intervention iconDivine Intervention, Collectible Hemoptysis iconHemoptysis, and Collectible Knockout Drops iconKnockout Drops are strong knockback. They do not decrease from the enemy's friction and linger for a relatively long time once applied. Any enemy affected by it takes 10 + 2 × (floor - 1) damage upon being pushed into walls or obstacles. No other knockback can deal such damage however strong it is.

Items that Cause Knockback[ | ]

Activated Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Butter Bean 5.100.294
Butter Bean
3 seconds
Reusable knock-back Upon use, Isaac farts and knocks back nearby enemies (except in Rebirth) and projectiles. (in Repentance) Enemies pushed into walls or obstacles take 12 damage. 1
The Bean 5.100.111
The Bean
1 room
Toot on command Isaac farts, poisoning any enemy in close range. 0
The Poop 5.100.36
The Poop
1 room
Plop! Spawns a pile of PoopPoop where Isaac is standing and knocks back nearby enemies. May yield pickups like regular poop. 0

Passive Items[ | ]

Name ID Icon Quote Description (in Repentance) Quality
Isaac's Heart 5.100.276 Isaac's Heart Protect it Isaac himself is now immune to all damage, and a heart familiar follows him. If the heart is hurt, Isaac is hurt. (in Repentance) The heart charges up as Isaac shoots, firing 8 blood shots, knocking back enemies, and leaving a puddle of creep when released. 0
The Black Bean 5.100.180 The Black Bean Toot on touch (except in Repentance) When taking damage, Isaac farts, poisoning enemies in range.
(in Repentance) When taking damage, Isaac farts five times, poisoning and knocking back nearby enemies and leaving lingering poison clouds.
0
(except in Rebirth) Farting Baby 5.100.404 Farting Baby He farts! Spawns a familiar that follows Isaac and blocks enemy shots. If a shot hits Farting Baby, it has a chance to fart, which charms, poisons, or knocks back nearby enemies. 1
(in Repentance) Belly Jelly 5.100.690 Belly Jelly Bounce away! Causes enemies to bounce off of Isaac, dealing damage to them if they hit an enemy or obstacle. Also gives Isaac the chance to deflect enemy shots. 3
(in Repentance) Hemoptysis 5.100.726 Hemoptysis Double tap sneeze Double-tapping a fire button causes Isaac to sneeze blood, dealing damage to enemies in front of him. Affected enemies are cursed and take more damage from Collectible Brimstone iconBrimstone-like attacks. 1
(in Repentance) Knockout Drops 5.100.637 Knockout Drops They pack a punch! Adds a chance to shoot a fist tear that has extremely high knockback and confuses enemies. 3

Trinkets[ | ]

Name ID Icon Quote Description
Butt Penny 5.350.24 Butt Penny Wealth of gas Isaac will fart when he picks up a coin. Coins have a higher chance to drop from PoopPoops.
Mysterious Candy 5.350.25 Mysterious Candy Uh-oh! Isaac farts or poops at random intervals. Getting hit can also trigger the effect.

Notes[ | ]


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