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Razor Blade

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Razor Blade is an unlockable activated item.

A silver, sharp razor blade.

Effects[]

Allows trading hearts for more damage in the current room upon each activation.

Isaac pays a full heart in normal state but half a heart while recovering from damage (Isaac blinking). Basic Damage is increased by 1.2. Final Damage increment on each use decreases with the number of repeated usages because of the square root "soft cap" in the damage formula.

Pays Soul Hearts if Isaac has less than one full Red Heart. Otherwise, it takes Eternal Hearts first, then Red Hearts.

Notes[]

  • Using the Razor Blade will count as damage for 'No-Damage-Runs'.
  • According to Edmund in this video, using the Razor four times results in double damage for that room.
  • DLC2 The Last-Will Symbol of Razor Blade will be blank if you killed yourself with it.

Synergies[]

  • Items that grant temporary invulnerability like Celtic Cross or The Polaroid allows unlimited usage of Razor Blade for free while invulnerable, granting a huge damage boost. Very helpful when fighting late game bosses.

Gallery[]

Trivia[]

  • After using this item, Isaac looks like a Dople.
  • The item itself is a reference to the act of cutting one's self, usually at the wrists, to inflict self-harm or to commit suicide by loss of blood.

Bugs[]

  • In The Womb and all levels onwards:
    • Heart price doubles
    • Moreover, if Isaac has just enough Red Hearts for the trading and some spare Soul Hearts, it doesn't utilize those Soul Hearts but uses up all the Red Hearts, thus killing Isaac. A remedy is to always keep a half damaged Red Heart container.
  • See also: Scapular's Bugs section
Items
Passive Items Tear Modifiers: The Inner Eye • Spoon Bender • My Reflection • Skatole • Cube of Meat • Cupid's Arrow • Dr. Fetus • Mom's Eye • Wiggle Worm • Technology • Chocolate Milk • Loki's Horns • Little Chubby • Spider's Bite • The Common Cold • The Parasite • Mom's Contacts • Mom's Knife • Ouija Board • Brimstone • A Lump of Coal

(Wrath of the Lamb DLC: IPECAC • Tough Love • Technology 2 • Mutant Spider • Epic Fetus • Polyphemus • Sacred Heart)

Stat Ups: The Sad Onion • Max's Head • Number One • Blood of the Martyr • Magic Mushroom • Roid Rage • Raw Liver • Lunch • Dinner • Dessert • Breakfast • Rotten Meat • Wooden Spoon • The Belt • Mom's Underwear • Mom's Heels • Mom's Lipstick • Wire Coat Hanger • Steven • Pentagram • The Mark • Growth Hormones • Mini Mushroom • The Pact • Small Rock • Super Bandage • Robo-Baby • Little C.H.A.D. • Little Gish • Little Steve • The Relic • The Halo • Money Equals Power • Blood Bag • Odd Mushroom (Thin) • Odd Mushroom (Large) • Whore Of Babylon • Bucket Of Lard
(Wrath of the Lamb DLC: Stigmata • Speed Ball • Chemical Peel • Bloody Lust • Cat-O-Nine-Tails • Stem Cells • Tooth Picks • SMB Super Fan! • MEAT! • Magic 8 Ball • Squeezy • Jesus Juice)

Familiars and Orbitals: Brother Bobby • Halo Of Flies • Distant Admiration • Sister Maggy • Guardian Angel • Demon Baby • Dead Bird • Forever Alone • Sack Of Pennies • Bomb Bag
(Wrath of the Lamb DLC: Bum Friend • The Peeper • Ghost Baby • Harlequin Baby • Daddy Longlegs • Sacrificial Dagger • Rainbow Baby • Holy Water • Guppy's Hair Ball • Abel)

Others: 1UP • The Virus • Less Than Three • Skeleton Key • A Dollar • A Quarter • Boom! • Transcendence • The Compass • PHD • Rosary • XRay Vision • Lucky Foot • Magneto • Treasure Map • The Ladder • Charm Of The Vampire • The Battery • Steam Sale • Dead Cat • Lord Of The Pit • Spelunker Hat • Mr. Mega • The Wafer • 9 Volt • Bobby-Bomb
(Wrath of the Lamb DLC: Guppy's Tail • Mom's Purse • Bob's Curse • Pageant Boy • Scapular • Infestation • The Mulligan • Habit • Spirit Of The Night • Ankh • Celtic Cross • Mitre • Fate • The Black Bean • Holy Grail • Dead Dove • Pyro • 3 Dollar Bill •Mom's Coin Purse • Box)

Activated Items Base Items: The Poop • Mr. Boom • Tammy's Head • Mom's Bra • Kamikaze • Mom's Pad • Bob's Rotten Head • Teleport! • My Little Unicorn • Yum Heart • Doctor's Remote • Shoop Da Whoop! • Lemon Mishap • The Hourglass • The Nail • We Need To Go Deeper! • Deck of Cards • Monstro's Tooth • The Gamekid • Mom's Bottle of Pills • The Dice • The Pinking Shears • The Bean • Dead Sea Scrolls • Razor Blade • Forget Me Now • A Pony

(Wrath of the Lamb DLC: Guppy's Paw • IV Bag • Best Friend • Remote Detonator • Guppy's Head • Prayer Card • Notched Axe • Crystal Ball • Crack The Sky • The Candle • D20 • Spider Butt • Dad's Key • Portable Slot • White Pony • Blood Rights)

Books: The Bible • The Book of Belial • The Necronomicon • Book Of Revelations • Book of Shadows • Anarchist Cookbook • The Book Of Sin • Monster Manuel
(Wrath of the Lamb DLC: Telepathy for Dummies)

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