Bone Serpent

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Bone Serpents are burrowing worm-like enemies that spawn in the Underworld. They consist of 14–20 segments in total.


Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
2 values: Pre-Hardmode › Hardmode
3 values: Pre-Hardmode › Hardmode › Post-Plantera
NPC ID Type Damage Defense
39 Bone Serpent Head.png Bone Serpent Head 36/72/108 12
40 Bone Serpent Body.png Bone Serpent Body 20/40/60 18
41 Bone Serpent Tail.png Bone Serpent Tail 16/32/48 18


  • Bone Serpents are not restricted to the Underworld, and can follow the player out.


  • As with most worms, weapons that can hit multiple segments at once are effective. Some effective weapons are the Vilethorn, flails, and the Crimson Rod.


  • Bone Serpents are one of the few pre-Hardmode enemies that do not get stronger upon reaching Hardmode in an Expert or Master world.
  • Sometimes a Bone Serpent can be seen leaping in the lava in the background as ambience.
  • The BestiaryBestiary entry for the Bone Serpent: "Mighty serpentine dragons once ruled hell, but long ago shed their obsidian scales. A skeletal husk is all that remains."



  • Desktop 1.4.4:
    • Head/Body/Tail Damage increased from 30/15/10 to 36/20/16, and Head/Body Defense increased from 10/12 to 12/18, with Tail unchanged.
    • Health increased from 250 to 300, and movement speed also increased.
    • Now has further stat bonuses specifically on the FTW and the Everything Seed.
  • Desktop 1.1: All segments now share a life counter, instead of individual life counters for all segments. Previously Head, Body and Tail had 120, 150 and 200 health, respectively.