Whip of Hades

This whip does not appear in real world mythology of the Greek Cthonic God Hades. 
In world, however the Whip of Hades, is an artefact that was told to the party during Oto's research into Godkilling weapons as a potential candidate. It seems to have been lost from the Underworld and has been making odd appearances throughout history where suddenly mass death follows and it is usually attributed to the whip. It is rumored to have life stealing effect on it's victims, it also seems to strike foes on anyone who bears witness not that they usually live to tell about it. It seems to also be related to improved stealth and intimidation to it's weilder.