The Jade-Walker

The Jade-Walker is Cosmic's third sword which he forged from the dead body of the enemy of the same name who was made out of Jade.

History
It wasn't until Season 3 of Elements where Cosmic decided to forge Jade-Walker's dead body into a sword. However it was later stolen, but then returned.

Trivia

 * Unlike his main sword, The Jade-Walker didn't have a prievous owner.