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Terraria Wiki

Bone Serpents are burrowing worm-like enemies that spawn in The Underworld. They are immune to lava as well as the Poisoned, On Fire!, and Cursed Inferno debuffs. Bone Serpents 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 30/60/90 10
40 Bone Serpent Body.png Bone Serpent Body 15/303026/454539 12
41 Bone Serpent Tail.png Bone Serpent Tail 10/202018/303027 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 don't 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 1.1: 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.