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Monster ID 198
Locations The Haert of the Cyrpt: The Haert of Darkness
Hit Points 120
Attack 90
Defense 81
No-Hit 100
Initiative 90
Meat None
Phylum undead
Elements spooky
Resistance None
Monster Parts head, tail, torso, wing
rib of the Bonerdagon or vertebra of the Bonerdagon
Quest skull of the Bonerdagon, chest of the Bonerdagon
Manuel Entry
refreshedit data
Bonerdagon You're fighting The Bonerdagon

As you enter the Haert of the Cyrpt, you hear a squawking roar, followed by a roaring squawk. This huge creature rises from a pile of bones, flaps its wings, and advances toward you.

Hit Message(s):

He spikes you in the <face> with his boney wings. Oof! Argh! Ouch! (spooky damage)

He gores you with his horns, then horns you with his gore. Ooh! Argh! Ooh! (spooky damage)

He chomps on your <calf> with his great white fangs. You feel about half as shy as you'd feel if he bit you again. Ouch! Ouch! Eek! (spooky damage)

He whips you with his boney tail. You wish he wouldn't lash out like that. Eek! Ow! Ow! (spooky damage)

Critical Hit Message:

He gores you in the stomach, chomps you in the leg, and whips you with his bony tail. Yes! You've hit the perfect pain trifecta! Oof! Ooh! Ow! Ow! Argh! (spooky damage)

Miss Message(s):

He flaps his boney wings at you, but you ask how he can fly with those things and he crashes to the ground.

He tries to gore you with his horns, but you leap out of the way.

He tries to chomp you with his great white fangs, but you dodge.

He tries to whip you with his boney tail, but reports of his ability to do that are phony tales.

Fumble Message:

He flaps his wings and rises higher in the air, roaring triumphantly. Then he snags a wing on the ceiling of the cyrpt, breaks it off, and crashes to the ground. It takes his head a while to figure out which of the scattered bones on the floor are his. (FUMBLE!)

After Combat

  • Occasionally, when using a skill:
As you're preparing to use that skill, The Bonerdagon suddenly starts furiously beating its wings. You're knocked over by the gust of wind it creates, and lose track of what you're doing.
  • Occasionally, when using an item:
Just as you're pulling the $item out of your pocket, The Bonerdagon lashes out at you with its tail and knocks it out of your hand.

The flapping of the Bonerdagon's wings is producing too much wind for you to safely use that item.

Dragskull.gifYou acquire an item: skull of the Bonerdagon (100% chance)*
Bonechest.gifYou acquire an item: chest of the Bonerdagon (100% chance)*
Rib.gifYou acquire an item: rib of the Bonerdagon (100% chance)*
Vertebra.gifYou acquire an item: vertebra of the Bonerdagon (100% chance)*
You gain 22-23 <substat>.

Occurs at The Haert of the Cyrpt.


  • The Bonerdagon has the ability to cause skills and items to fail entirely, wasting your MP. Items and skills are blocked 25% of the time.
  • The Bonerdagon can still block your items and skills when it is trapped with Entangling Noodles.
  • The Bonerdagon will not block the Dictionary.
  • Once you have defeated the Bonerdagon, this adventure will no longer reoccur (becomes a one time adventure).
  • The Bonerdagon's name is a misspelling of "Bonedragon". Many KoL players mistakenly refer to this monster as the "Bonerdragon".
  • This monster cannot be copied.


  • Prior to a trivial update on February 15th, 2012, the Bonerdagon would destroy blocked combat items. This is no longer the case.
  • If your Moxious Maneuver failed, you would get the message:
You try to sneak up behind the Bonerdagon, but you step on a discarded bone and draw his attention to you.
  • In a hidden update in the middle of the day on February 4th, 2014, the image changed. It used to be:


  • One of his successful attacks is a play on the proverb "Once bitten, twice shy."
  • The spell block message may be a reference to the Yu-Gi-Oh! Card game where the spell card "A Wing Beat of a Great Dragon" is used to sweep all of the spell/trap cards off the board.