The Chain Knife is the weakest flail weapon in the game. It is rare drop from Cave Bats. It deals 11 melee damage with a fast attack rate and very weak knockback. It appears to be a spearhead on a chain. Although being a flail, it acts very much like a boomerang, as it is not affected by gravity and moves straight out, then returns back to the player.
- This is likely a reference to Scorpion's main weapon of choice from the Mortal Kombat franchise.
- This weapon is very similar to the Chain Guillotines, which has two blades, rather than one.
- It is one of the few flails that can not be thrown through Doors.
- The Chain Knife used to drop from Chaos Elementals due to a typo in the code, it was instead supposed to drop the Rod of Discord (Fixed as of 184.108.40.206).
- Just like the Depth Meter, the Chain knife also drops from cave bats spawned by Bat Statues.
- Now drops from Cave Bats instead of Chaos Elementals.
- Added to the game.