Bone Serpent

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.

It's Bestiary entry states: "Mighty serpentine dragons once ruled hell, but long ago shed their obsidian scales. A skeletal husk is all that remains. "

Tips

 * 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.

Trivia

 * According to the Bestiary, Bone Serpents are undead remnants of serpentine obsidian dragons which once ruled the Underworld.
 * Bone Serpents are one of the few pre-Hardmode enemies that don't get stronger upon reaching Hardmode in an Expert or Master world.

History
Knochenschlange Squelette de serpent 뼈다귀 뱀 Bone Serpent Bone Serpent Костяной змей 骨蛇