The Bone Serpent is one of the burrowing monsters, capable of moving through blocks, and it can be found in The Underworld. It is the strongest of the non-boss enemies before defeating the Wall of Flesh. It is also equal in health with the Digger. In order to kill a Bone Serpent, you need to destroy at least one section. The tail can be "killed" without killing the rest of the Bone Serpent. This is very similar to The Destroyer.

The Bone Serpent is, like all burrowing enemies, immune to lava. Each section of a Bone Serpent will drop loot, but as they are usually defeated by destroying one segment of their bodies they tend to drop only one item. Applying large damage to multiple body sections at once with Dynamite will result in loot from every body section. This can drastically increase the loot gained from Bone Serpents.


  • When digging to the bottom of a map in the Underworld, there is a chance that, while standing near the bottom, the Bone Serpent will tunnel off the map and disappear.
  • The Bone Serpent is visible when inside pitch-black areas, as if it is a cave or an unlit area.
  • If you're having trouble surviving a fight with a Bone Serpent, you can use a Grappling Hook on a high ceiling and it will not be able to reach you, where you can leisurely shoot at it with ranged weapons.
  • Bone Serpents can spawn if you are not directly in the Underworld, but very close to it.
    • They can also dig straight up through a hellevator, if they so wish to do so, and invade your house.
  • It is possible to lure a Bone Serpent out of the Underworld and all the way to the Surface.
  • A quick and easy method of dispatching a Bone Serpent is using the Demon Scythe spell. Simply wait for it to attack, dodge and quickly deploy multiple scythes. It should deal a large amount of damage and even kill it.
  • One good way to attack the Bone Serpents is to use a Spear weapon such as the Dark Lance which has a long reach. A stab and back-stab from a Dark Lance is enough if used correctly.
  • A useful weapon against the bone serpent is the Vilethorn (or any piercing Weapon, for example, flails or spears). The vilethorn can deal significant damage even when it is below you. Another way is to use the vilethorn with a Hunter Potion so you can see it at all times. You could also wait for him to (re)appear and throw a flail right through him, which also inflicts massive damage.
  • The Space Gun's good base damage and the ability to penetrate 2 enemies (hitting a total of 3) could quickly destroy the Bone Serpent.


  • It has been found that instead of disappearing, the Bone Serpent will frequently die off-screen without any player interference.
  • Like all worms, the Bone Serpents spawn curled up in a ball.
  • Formerly, it will drop Sunfury, the most powerful pre-hardmode flail. However it's now found in locked Shadow Chests.


  • In multiplayer, it is possible for the bone serpent to spawn in mid-air while onscreen. It is also capable of staying alive with only a head, and can use the head of another monster.



  • Now has a new death sound, no longer drops Sunfury, and its hit-box has been fixed.

PC release

  • Added to the game.


Monsters (Hardmode Monsters are in italic)
Slime Monsters Baby Slime · Black Slime · Blue Slime · Corrupt Slime · Crimslime · Dungeon Slime · Green Slime · Hoppin' Jack · Ice Slime · Illuminant Slime · Jungle Slime · Lava Slime · Mother Slime · Pinky · Purple Slime · Red Slime · Sand Slime · Shadow Slime3DS · Slimeling · Slimer · Spiked Ice Slime · Spiked Jungle Slime · Toxic Sludge · Umbrella Slime · Yellow Slime
Goblins Goblin Archer · Goblin Peon · Goblin Scout · Goblin Sorcerer · Goblin Thief · Goblin Warrior · Goblin Summoner
Undead Monsters Angry Bones · Armored Skeleton · Big Boned · Blue Armored Bones · Bone Lee · Dark Caster · Doctor Bones · Heavy Skeleton · Hell Armored Bones · Rusty Armored Bones · Short Bones · Skeleton · Skeleton Archer · Skeleton Commando · Skeleton Sniper · Tactical Skeleton · The Groom · Tim · Undead Miner · Undead Viking · Vampire Miner3DS · Zombie
Humanoids Chaos Elemental · Clown · Dark Mummy · Light Mummy · Mummy · Nymph · Possessed Armor · Shadow Mummy3DS Spectral Elemental3DS · Spectral Mummy3DS · Werewolf
Mages Dark Caster · Fire Imp · Goblin Sorcerer · Tim · Rune Wizard · Desert Spirit
Plant Monsters Angry Trapper · Dragon Snatcher3DS · Clinger · Man Eater · Snatcher
Burrowing Monsters Bone Serpent · Devourer · Digger · Giant Worm · World Feeder · Tomb Crawler · Dune Splicer
Flying Monsters Angry Nimbus · Antlion Swarmer · Arch Demon3DS · Big Eater · Big Stinger · Bird · Cave Bat · Corruptor · Crimera · Crimson Axe · Cursed Hammer · Cursed Skull · Demon · Demon Eye · Dragon Hornet3DS · Dragon Skull3DS · Dragon Stinger3DS · Drippler · Eater of Souls · Enchanted Sword · Floaty Gross · Flying Fish · Gastropod · Ghost · Giant Bat · Giant Cursed Skull · Giant Flying Fox · Harpy · Hellbat · Hornet · Ice Bat · Ichor Sticker · Illuminant Bat · Jungle Bat · Lava Bat · Little Eater · Little Stinger · Meteor Head · Moss Hornet · Pixie · Raven · Red Devil · Shadow Hammer3DS · Spectral GastropodConsole · Voodoo Demon · Vulture · Wandering Eye · Wraith
Swimming Monsters Angler Fish · Arapaima · Blue Jellyfish · Corrupt Goldfish · Crimtane Goldfish · Goldfish · Green Jellyfish · Orca3DS · Pink Jellyfish · Piranha · Shark · Squid
Hopping Monsters Bunny · Corrupt Bunny · Crimtane Bunny · Derpling · Giant Shelly · Giant Tortoise · Herpling · Ice Tortoise · Mimic · Slimes
Mini-Boss Monsters Arch Wyvern3DS · Dreadnautilus · Wyvern
Boss Monsters Brain of Cthulhu · Duke Fishron · Eater of Worlds · Eye of Cthulhu · King Slime · Empress of Light · Queen Slime · Golem · Ocram3DS · Plantera · Queen Bee · Skeletron · Skeletron Prime · The Destroyer · The Twins · Wall of Flesh · Mourning Wood · Pumpking · Everscream · Santa-NK1 · Ice Queen · Martian Saucer · Lunatic Cultist · Nebula Pillar · Solar Pillar · Stardust Pillar · Vortex Pillar · Moon LordFinal Boss
Boss-Related Monsters Dungeon Guardian · Leech · Probe · Servant of Cthulhu · Servant of Ocram3DS · The Hungry
Immortal Blazing Wheel · Spike Ball
Projectile Burning Sphere · Chaos Ball
Other Albino Antlion3DS · Angry Tumbler · Antlion · Antlion Charger · Antlion Swarmer · Crab · Crawdad · Jungle Creeper · Mr. Stabby · Salamander · Snow Balla · Snowman Gangsta · Unicorn
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