User:Apollyon man/Sandbox/Mom's Knife

• Rebirth
• Flash

Item Icon
Pickup Quote	"Stab stab stab"
Entity ID	5.100.114
Tear Appearance
Item Pool	Mom's Chest Old Chest Devil Room Treasure Room Devil Room Treasure Room
Collection Grid	(page 2, column 1, row 2) (page 1, column 11, row 6)
Unlock Method	Defeat Satan as Isaac

Mom's Knife is a Special unlockable passive item.

Effects

• Isaac's tears are replaced by a knife that pierces enemies and can travel through obstacles. Holding down the fire button increases its range and power.
  • The knife can hurt enemies while Isaac is holding it.
  • The knife deals 2x Isaac's damage while held and 6x damage at the furthest possible point of its arc, regardless of the actual maximum range stat.
• This item belongs to the Yes Mother? set. Collecting three items from this set will transform Isaac into his mother.

Notes

• The knife can be held and fired diagonally. Firing the knife diagonally requires a frame perfect input. However, this can be done easily with a controller's analog stick.
• The knife will not work in challenges with the Blindfolded effect.

Synergies

• Bookworm Transformation: 2 knives occasionally (based on luck) will fire forward in the direction aimed, splitting apart in trajectory slightly.
• Brimstone: Firing the knife also shoots a barrage of knives that goes across the screen, with each knife doing 80% of Isaac's damage. The longer the charge, the more knives are added. This effect does not work with Azazel's default mini brimstone. The brimstone-knives do not benefit from A Lump of Coal.
• Chocolate Milk: Tears up instead of additional damage or charge effects. Knife will also be colored brown.
• Continuum: The knife can now travel through walls and appear out of the opposite wall but will still have the boomerang effect.
• Epic Fetus: No effect.
  • Each explosion shoots 10 knives in a circle from the point of impact.
• Eve's Mascara: Damage is doubled. However, the knife takes longer to charge.
• Fire Mind: Still applies burning but no longer explodes.
• Flat Stone: Knife bounces as it flies away from Isaac, each bounce splash causing Isaac's base damage.
• The Forgotten: The knife attaches to the Forgotten's bone club, forming a scythe with a larger swing and higher damage.
• Ghost Pepper: The flames can shoot from Isaac while holding the fire button.
• Gnawed Leaf: The held knife can damage enemies while Isaac is invincible.
• Godhead: The knife homes in on enemies, but it does not gain a damaging halo.
• Guppy Transformation: Knife hits will rarely spawn an attack fly.
• Haemolacria: Haemolacria works with minimal tear delay while Mom's Knife has to be charged.
• Homing Tears: Knives home in on enemies and colors the knife purple. It will stick on enemies for a second and make small lunges towards other enemies.
• The Inner Eye: Isaac holds only one, but shoots three knives. Slower charge time.
• Ipecac: Knife turns green and may poison monsters that hit it.
  • Also adds +4 damage.
• Loki's Horns: Adds three knives in the other directions that the primary knife is facing. These knives will sometimes fire when the primary knife is fired. This is affected by luck; the higher Isaac's luck is, the higher the chance the other knives will fire as well. Like the primary knife, they can be used as melee weapons.
• Lost Contact: The knife will block bullets, even when held. Furthermore, the knife will not vanish after canceling a bullet, and therefore can cancel out several bullets at once while being shot or held.
• The Ludovico Technique: Isaac controls a floating knife that deals 2x Isaac's damage. Tears stat is ignored and damage is dealt at a rate equivalent of 5 tear delay.
  • The Ludovico Technique + Mom's Eye: Isaac controls a floating knife surrounded by 1 rotating knife.
  • The Ludovico Technique + The Inner Eye: Isaac controls a floating knife surrounded by 2 rotating knives.
  • The Ludovico Technique + Mutant Spider: Isaac controls a floating knife surrounded by 3 rotating knives.
  • The Ludovico Technique + Lost Contact: Floating knife loses almost all ability to block bullets. Only blocks shots that cross a very specific, small point on the knife. (Seems to be close to where hilt meets blade on the sprite.)
  • The Ludovico Technique + Loki's Horns: Loses Loki's Horns effect; Isaac controls only one floating knife.
• Mom's Eye: Adds a second knife in the opposite direction that the primary knife is facing. This knife can sometimes fire when the primary knife is fired. This is affected by luck; the higher Isaac's luck is, the higher the chance the other knife will fire as well. Like the primary knife, it can be used as a melee weapon.
  • Mom's Eye + Loki's Horns: Results in a total of four knives like Loki's Horns on its own, but the secondary knives fire with the same frequency that the single Mom's Eye knife would.
• Mom's Knife: If picked up twice in the same run, two knives are fired at once.
• Monstro's Lung: Fires a cluster of 3-5 knives at maximum charge, each dealing 2x damage.
• Mutant Spider: Isaac holds only one, but shoots four knives. Slower charge time.
  • Mutant Spider + The Inner Eye: Isaac shoots seven knives.
• My Reflection: No effect.
• Poison Tears: Knives gain a chance to poison enemies.
• Proptosis: The Knife deals double damage regardless of range.
• Strange Attractor: Enemies and pickups are attracted to the knife, even when not charging or firing.
• Tammy's Head: Fires 10 knives in a circle around Isaac, dealing massive damage.
• Tech.5: Both fire normally.
• Tech X: Both fire normally.
• Technology 2: While charging Mom's Knife, Technology 2 will still fire.
• Trinity Shield: Blocks bullets in the direction the knife is held, giving enough protection to walk up to and melee enemies, or just to safely shoot the knife.
• Unicorn Stump and other invincibility items: Even though the knife cannot be fired, the knife will deal damage while Isaac is invincible.
• The Wiz: Grants two knives that fire diagonally.

Interactions

• Anti-Gravity: Only tear delay down applies.
• Compound Fracture: Overridden by Mom's Knife.
• Cricket's Body: Tear delay and range down. No splitting effect.
• Cursed Eye: Overridden by Mom's Knife.
• Dead Onion: No effect.
• Death's Touch: Increased damage and decreased tear rate. No scythe visual effect.
• Dr. Fetus: Overridden by Mom's Knife.
  • Both the knife and the bombs fire normally.
• Explosivo: Overridden by Mom's Knife.
• Euthanasia: Overridden by Mom's Knife.
• Eye of Belial: Overridden by Mom's Knife.
• Holy Light: No effect.
• Lachryphagy: Overridden by Mom's Knife.
• A Lump of Coal: Gives no damage boost but colors the knife dark brown.
• Marked: Only tears up and range up apply.
• Monstro's Lung: Overridden by Mom's Knife.
  • Firing a knife causes several other knives to shoot out at random directions.
• Mysterious Liquid: Overridden by Mom's Knife.
• Number One: Greatly reduces Mom's Knife range.
• The Parasite: Overridden by Mom's Knife.
• Piercing Tears: No effect.
• Pop!: Overridden by Mom's Knife.
• Proptosis: Damage is doubled and no damage decrease with distance.
• Pupula Duplex: Overridden by Mom's Knife.
• Rubber Cement: Overridden by Mom's Knife.
• Scorpio: Overridden by Mom's Knife.
• Soy Milk: Damage drastically reduced at the benefit of a slightly better fire rate.
• Technology: Overridden by Mom's Knife.
  • Both the knife and the laser fire normally.
• Tiny Planet: Knives go in a spiral around Isaac; the longer the knife is charged, the bigger the spiral. Not recommended, as this makes Mom's Knife almost impossible to aim.
• Tractor Beam: When Isaac changes direction, the knife snaps into the direction Isaac is facing.
• Trisagion: Overridden by Mom's Knife.

In-game Footage

Trivia

• This item is used in Challenge #26 (I RULE!).
• In the original Binding of Isaac, buying the item from the Devil Room cost 1 heart container instead of 2.
• The description of the item is a possible reference to the sniper's dialogue in Team Fortress 2.

Seeds

PC 8CKM J108 (Treasure room adjacent to spawn)

PC 6PG9 7RK3 (Treasure room up and to the right one room from spawn)

PC DVNV YV9Y (Treasure room adjacent to spawn)

PC JW43 H8EK (Treasure room adjacent to spawn)

PC 1M9E Y1G1 (Treasure room adjacent to spawn)

PC P8SE A9JW (Treasure room adjacent to spawn)

PS4 S63T 434W (Treasure room adjacent to spawn)

Switch JZCL 97JE (First Golden Treasure Room)

Bugs

Bug!	The Blindfolded condition also applies to the knives fired by Tammy's Head, and prevents it from working.

A butcher's knife.

Effects

Isaac wears Mom's dress.

Isaac will have his tears replaced by a single, penetrating knife. It can be shot diagonally by using two arrow keys (holding up and right will aim it diagonally for example.) It can also be used as an upfront melee weapon, in which case it does high damage and possibly instantly kills any non-boss enemies that its edge touches. The knife deals three times the melee damage when thrown, then two times when it stops, and same damage as melee when it comes back. On the other hand, the DPS is higher when using the knife as a melee weapon. Familiars will fire tears while the knife is charging.

Notes

• The knife is tied to Isaac's base damage and shot effects (e.g. Spider Bite).

• A high tears stat will shorten the charge duration for the knife.

• The distance the knife is able to travel is fixed at all times and therefore does not depend on the range stat. However, range ups will decrease the time it takes to charge the knife (similar to Tears).

Interactions

• Brimstone, Dr Fetus - Mom's Knife overrides Brimstone and Dr Fetus with no special effect.

• The Candle - If the Candle is activated while the knife is in mid-throw the knife will continue to move in a direction and speed that matches the movement of the player at the instant the candle was activated. The knife will continue to deal damage to whatever it touches and will return to the player as soon as the candle is used or deactivated. This also works with items such as Bob's Rotten Head or Notched Axe.

• Ipecac, The Inner Eye, Mutant Spider - Mom's Knife overrides all of these items, with a longer charge time and no damage increase.

• Technology - Mom's Knife overrides Technology with no special effect.

• Technology 2 - Mom's Knife overrides Technology 2, with the 65% damage still applying to Mom's Knife, making this synergy not recommended. Although the Technology 2 laser will still appear to fire, it is purely cosmetic and deals no damage.

• Mom's Eye - Mom's Knife completely overrides Mom's Eye if Mom's Eye is picked up after Mom's Knife

• Wiggle Worm - The knife stalls in the air when thrown upwards or downwards and wiggles up and down when fired left or right.

• Max's Head, Magic Mushroom - Mom's Knife does not stack with the 1.5x multipliers of these items or any other 1.5x multipliers.

Synergies

• Certain tear affecting items also affect Mom's Knife, changing its color as well.

[[File:Knife the common cold.png]]	The Common Cold Tints the blade green and gives it a chance to poison enemies.
[[File:Knife number one.png]]	Number One Tints the blade yellow and makes it charge much quicker. The range down does not affect Mom's Knife in any way.
[[File:Knife the small rock.png]]	Small Rock Tints the blade grey and increases damage.
[[File:Knife a lump of coal.png]]	A Lump of Coal Tints the blade black, but damage is unaffected.
[[File:Knife moms contacts.png]]	Mom's Contacts Tints the knife red and provides a chance to temporarily freeze enemies.
[[File:Knife spoon bender.png]]	Spoon Bender Tints the blade purple and gives a slight homing effect.
[[File:Knife ouija board.png]]	Ouija Board Tints the blade grey and makes it spectral. This synergy has no real effect on Mom's Knife, as it can already go through obstacles. However, this does make destroying poop and [[fire]]s with Mom's Knife more difficult.
[[File:Knife sacred heart.png]]	Sacred Heart The blade turns white and deals much more damage with shorter recharge time.
[[File:Knife the parasite.png]]	The Parasite Turns the blade brown with no additional effects.
[[File:Knife spiders bite.png]]	Spider Bite Tints the blade white and provides a higher chance of slowing enemies.

• My Little Unicorn/VII Chariot - In addition to the damaging on touch effect, the knife does not disappear, allowing you to stab, throw the knife, and charge around at the same time, dealing high amounts of damage.

• Pinky Eye - There is a 10% chance of the blade becoming poisonous (will appear green) upon entering a room.

• Polyphemus - Greatly increases the damage of Mom's Knife without any effect on charge time. This synergy is strong enough to kill most bosses in under a second.

• Mom's Bra - Isaac can deal high damage to any frozen enemy by simply standing near them, with little risk of being damaged himself.

Trivia

• This item is based on the kitchen knife Mom took to sacrifice Isaac.
• Firing Mom's Knife will still leave small puddles as if Isaac were still firing tears.

Bugs

• As shown by the video below, The Candle with Mom's Knife makes the knife fly slowly toward that direction until it reaches the end of the wall or until you use the Candle shot.
• Mom's Knife can sometimes float in the air aimlessly, even if it is not the candle glitch.
• If the player has 3 Dollar Bill, the knife will have a randomized color in every room. If the player has homing tears (purple knife) for example, the knife could be red, too.

Videos

[[File:Binding of isaac-Mom's knife The Candle bug 1.4.3|left|200px]]

Related Achievements

[[File:MomsKnife.jpg]] "Moms Knife" - Complete Sheol with Isaac.

The Binding of Isaac: Rebirth
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