Bone Serpent

The Bone Serpent is the strongest non-boss burrowing enemy, second only to the Eater of Worlds. Bone Serpents follow the Worm AI.Bone Serpents have a very rare chance of dropping a Flamelash or a Sunfury.

If you are looking to get the Flamelash or Sunfury try flooding the The Underworld with a lot of water. This will cause the Bone Serpent to move slowly through the water which makes it easy to kill.

Unlike other burrowing enemies the bone serpent has many different body parts making it harder to kill, A good way to counteract this is to get a high powered gun such as the Phoenix Blaster or the Space Gun. this will allow you to aim for one part of the body and take shots as it swoops to kill you.

If you aim to get a Flamelash or Sunfury it would be a good idea to bring many potions and have end game items, tools and equipment making it easier to stay alive for longer periods of time. If you want to increase your chances of getting a rare drop, carry a water candle with you to spawn more Bone Serpents.