[Technically not made by me] A total conversion of the original Ripper knife, made as an artifact in reptilian tech style. Available via this sigil or from a wooden box in the temple study.
Picking up or manifesting this knife will not create a solid, functional artifact. It must be activated, and this is very difficult. Its alignment is right hand rather than left hand as the original knife. The meaning of this is perhaps a fine matter of semantics. Would you say a whore is "service to self" or "service to others"? It's literally a service job, but maybe it gains her more then her clients? From that perspective, this is one is the opposite, whatever that means.
Suggested method of activation: hold the knife in right hand and sacrifice an evil demigod. Fortunately, evil demigods are in season now, you just need to capture one. Maybe asking Santa Muerte where to find one (and holding it down for you) will work if you can't find one on your own. (Just be respectful.)
