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Jaw Bone

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Item altar
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Jaw Bone is an unlockable passive item added in Booster Pack #5.

Effects[edit | edit source]

  • Spawns a familiar that flies around the room while firing, dealing double Isaac's tear damage to enemies that come in contact.
    • When thrown, the familiar will pierce through enemies if they are killed by the familiar, but the familiar will bounce back to Isaac if the enemy is not killed.
    • The familiar can retrieve pickups like The Boomerang The BoomerangThe Boomerang Icon.png4 secondsThrows a short-range boomerang which does a bit of damage and has a high chance to stun the enemy for 2 seconds. Can also be used to grab pickups..
    • Blocks enemy tears when stationary and when thrown.

Synergies[edit | edit source]

  • BFFS! BFFS!BFFS! Icon.pngIncreases the size and damage of familiars.: Familiar grows in size and does quadruple Isaac's tear damage to enemies.
  • Duct Tape Duct TapeDuct Tape Icon.pngStops Isaac's familiars from moving.: Jaw Bone will face in the same direction as Isaac and remain stationary as opposed to trailing behind him. Jaw Bone can still be fired.

In-game Footage[edit | edit source]

Trivia[edit | edit source]

  • This item is possibly a reference to Judges 15:16 where Samson kills a thousand men with a donkey's jaw bone.
  • Possibly a reference to the movie, The Frighteners, where Judge chases a ghost hound who keeps stealing his jaw bone.


The Forgotten  Unlocks The Forgotten Unlocks The Forgotten  Unlocks
|- Marrow Marrow Unlocked a new item. Defeat Mom's Heart or It Lives! on hard mode as The Forgotten 392
Slipped Rib Slipped Rib Unlocked a new item. Defeat Isaac as The Forgotten 393
Pointy Rib Pointy Rib Unlocked a new item. Defeat Satan as The Forgotten 394
Jaw Bone Jaw Bone Unlocked a new item. Defeat ??? as The Forgotten 395
Brittle Bones Brittle Bones Unlocked a new item. Defeat The Lamb as The Forgotten 396
Divorce Papers Divorce Papers Unlocked a new item. Complete the Boss Rush as The Forgotten 397
Hallowed Ground Hallowed Ground Unlocked a new item. Defeat Hush as The Forgotten 398
Finger Bone Finger Bone Unlocked a new item. Defeat Ultra Greed as The Forgotten 399
Dad's Ring Dad's Ring Unlocked a new item. Defeat Ultra Greedier as The Forgotten 400
Book of the Dead Book of the Dead Unlocked a new item. Defeat Delirium as The Forgotten 401
Bone Baby Bone Baby Unlocked a new co-player baby. Earn all Hard Mode Completion Marks as The Forgotten 402
Bound Baby Bound Baby Unlocked a new co-player baby. Defeat Mega Satan as The Forgotten 403
Moving Box Icon.png Booster Packs Moving Box Icon.png
#1
  • Angry Fly Angry FlyAngry Fly Icon.pngSpawns a fly familiar that orbits around a random enemy and deals 5 damage per tick to enemies it comes in contact with.
  • Black Hole Black HoleBlack Hole Icon.png4 roomsThrows a black hole on the ground which sucks in and damages enemies.
  • Bozo BozoBozo Icon.pngIncreases 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.
  • Broken Modem Broken ModemBroken Modem Icon.pngEnemies, enemy shots, tears, and pickups will briefly freeze in place at random intervals.
  • Mystery Gift Mystery GiftMystery Gift Icon.pngOne time useUpon use, spawns a random item from the current room's item pool, with a chance to spawn A Lump of Coal or The Poop instead.
  • Sprinkler SprinklerSprinkler Icon.png4 roomsUpon use, spawns a sprinkler that rotates and fires tears.
  • Fast Bombs Fast BombsFast Bombs Icon.pngGrants 7 bombs and allows bombs to be placed rapidly.
  • Buddy in a Box Buddy in a BoxBuddy in a Box Icon.pngGrants a familiar with a random tear effect. The familiar is randomized at the start of each floor.
  • Lil Delirium Lil DeliriumLil Delirium Icon.pngGrants a familiar that transforms into another random familiar every 10 seconds.
  • Hairpin HairpinHairpin Icon.pngFully recharges Isaac's active item upon entering a boss fight.
  • Wooden Cross Wooden CrossWooden Cross Icon.pngGrants a Holy Mantle shield upon entering a new floor, which protects against one hit of damage.
  • Butter! Butter!Butter! Icon.pngUsing an active item will drop it onto a pedestal on the ground. Taking damage may result in dropping a passive item.
  • Huge Growth Huge GrowthHuge Growth Icon.pngMakes Isaac large for the current room, increasing his range and damage.
  • Ancient Recall Ancient RecallAncient Recall Icon.pngSpawns 3 random cards.
  • Era Walk Era WalkEra Walk Icon.pngFor the current room, enemies are slowed, Isaac's speed is increased, and his shot speed is decreased.
#2
  • Jumper Cables Jumper CablesJumper Cables Icon.pngGrants an active item charge every 15 enemies killed.
  • Coupon CouponCoupon Icon.png6 roomsUpon use, makes a random item from a shop, devil deal, or black market free.
  • Telekinesis TelekinesisTelekinesis Icon.png3 secondsUpon use, for the next two seconds, any enemy shots that come near Isaac are held in place. After the charge is depleted, they are fired back as tears.
  • Moving Box Moving BoxMoving Box Icon.png4 roomsIf the box is empty, picks up all items and pickups in a room and stores them. If the box is not empty, places all stored items and pickups in the current room.
  • Technology Zero Technology ZeroTechnology Zero Icon.pngConnects Isaac's tears with electricity that can damage enemies.
  • Leprosy LeprosyLeprosy Icon.pngUpon taking damage, grants a body part as an orbital, which blocks enemy shots and deals 7 damage per tick to enemies it comes in contact with. The orbitals will be destroyed if they take enough damage from enemies or enemy shots.
  • Filigree Feather Filigree FeatherFiligree Feather Icon.pngAngels drop items instead of key pieces when defeated.
  • Dressing Table.png
#3
  • 7 Seals 7 Seals7 Seals Icon.pngGrants a random Harbinger familiar that changes every 10 seconds.
  • Mr. ME! Mr. ME!Mr. ME! Icon.png4 roomsSummons a controllable ghost that can perform various tasks depending on what it targets.
  • Angelic Prism Angelic PrismAngelic Prism Icon.pngGrants a prism orbital with a large orbital radius. Tears that pass through the prism split into four multi-colored tears.
  • Pop! Pop!Pop! Icon.pngReplaces Isaac's tears with eyeballs that can bounce off of each other. The eyeballs are not limited by range, and will instead dissipate when they stop moving or when hitting an enemy or obstacle.
  • Door Stop Door StopDoor Stop Icon.pngThe last door Isaac went through stays open, allowing him to leave the room even if enemies are in it.
#4
  • Death's List Death's ListDeath's List Icon.pngGrants a reward if all enemies in a room are killed in the order they are marked.
  • Haemolacria HaemolacriaHaemolacria Icon.pngTears 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.
  • Lachryphagy LachryphagyLachryphagy Icon.pngIsaac's tears decelerate as they travel. Upon stopping or hitting an obstacle, they burst into 8 tears in all directions. Tears can be fired into other tears to feed them, increasing their damage.
  • Trisagion TrisagionTrisagion Icon.pngTears are replaced with piercing white blasts of light.
  • Schoolbag SchoolbagSchoolbag Icon.pngAllows Isaac to hold two active items.
  • Extension Cord Extension CordExtension Cord Icon.pngBeams of yellow electricity flow between Isaac and his familiars, damaging any enemies between them.
  • Cross Grimace.png
  • Fistuloid.png
  • Gush.png
  • Soul Sucker.png
  • Tar Boy.png
  • Tube Worm.png
#5
  • Blanket BlanketBlanket Icon.pngGrants one soul heart. Upon entering a boss room, grants a shield that blocks one hit, then disappears.
  • Sacrificial Altar Sacrificial AltarSacrificial Altar Icon.pngOne time useUpon use, sacrifices up to 2 familiars and spawns an item from the Devil Room Pool for each familiar sacrificed.
  • Lil Spewer Lil SpewerLil Spewer Icon.pngSpawns a random pill, and grants a small Spewer familiar that charges up and fires different types of creep.
  • Marbles MarblesMarbles Icon.pngSpawns 3 random trinkets. Taking damage has a small chance to swallow Isaac's currently held trinket, gaining its effect permanently.
  • Mystery Egg Mystery EggMystery Egg Icon.pngSpawns an egg familiar, which cracks and turns into a random charmed enemy when Isaac is hurt. The egg regenerates upon entering a different room.
  • Flat Stone Flat StoneFlat Stone Icon.pngTears bounce off the floor. Tears that hit an enemy after bouncing deal splash damage to all nearby enemies for 25% of Isaac's tear damage.
  • Marrow MarrowMarrow Icon.pngGrants one bone heart and spawns three red heart pickups.
  • Slipped Rib Slipped RibSlipped Rib Icon.pngSpawns a bone familiar that circles around Isaac and reflects enemy shots.
  • Hallowed Ground Hallowed GroundHallowed Ground Icon.pngSpawns a white poop familiar, which turns into a white poop when Isaac is hurt.
  • Pointy Rib Pointy RibPointy Rib Icon.pngSpawns a bone familiar that can be aimed with the fire buttons and does contact damage.
  • Book of the Dead Book of the DeadBook of the Dead Icon.png4 roomsUpon use, spawns a charmed Bony or an orbital bone for each enemy killed in the current room.
  • Dad's Ring Dad's RingDad's Ring Icon.pngCreates a ring of light around Isaac that petrifies enemies in contact.
  • Divorce Papers Divorce PapersDivorce Papers Icon.pngSpawns a Mysterious Paper, increases tears, and grants a bone heart.
  • Jaw Bone Jaw BoneJaw Bone Icon.pngSpawns a familiar that flies the room while firing, dealing double Isaac's tear damage to enemies that come in contact and retrieving pickups.
  • Brittle Bones Brittle BonesBrittle Bones Icon.pngReplaces all red hearts with 6 empty bone hearts. Upon losing a bone heart, Isaac fires bones in 8 directions and permanently gains a tears up.
  • Broken Shovel Broken ShovelBroken Shovel 1 Icon.png4 roomsWhile held, causes multiple Mom's Foots to come down and stomp on Isaac. One of two parts necessary to create Mom's Shovel.
  • Broken Shovel Broken ShovelBroken Shovel 2 Icon.pngOne of two parts necessary to create Mom's Shovel.
  • Mom's Shovel Mom's ShovelMom's Shovel Icon.png4 roomsSpawns a trapdoor that leads to the next floor upon activation. Unlocks The Forgotten when used on a mound of dirt that appears in The Dark Room.
  • Rotten Penny Rotten PennyRotten Penny Icon.pngSpawns a blue fly every time a coin is picked up.
  • Baby-Bender Baby-BenderBaby-Bender Icon.pngGrants Isaac's familiars homing shots.
  • Finger Bone Finger BoneFinger Bone Icon.pngGrants a chance to gain a bone heart upon taking damage.
  • The Forgotten App.png
  • Crispy.png
  • Cross Stoney.png
  • Dank Charger.png
  • Leper.png
  • Mr. Mine.png
  • Mr. Red Maw.png
  • Boss The Matriarch.png
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