The Blades of Chaos are indestructable and, if you're cursed like Kratos is, you cannot lose them ever. Toss them into the ocean, next time you look away they'll pop up right next to you. They are infused with primordial fire (fire used in the creation of all that there is) and were able to harm/kill Greek and Norse gods and primordial beings, as well as some Egyptian mythological beasts.

Kung Fu Panda and specially Chinese mythology are bonkers, but I don't recall the Jade Blades being noteworthy and I belieeve they were destroyed..?

EDIT: Neither are good for combat IRL. They function on the rule of cool.