Could be a Viper throwing or boot knife. Known as a cold weapon. Looks close to it but the Viper is indeed a much better weapon. Or possibly a ceramic throwing knife.

Definitely some type of throwing knife.

Looks like one that would be good for throwing...

Definite Ninja activity. I am 100% certain a ninja used this knife. Most likely a high priest vatican assassin warlock.

On a serious note, their are no visible markings. So I doubt you will identify it. Sorry, I certainly can't identify it.