In the Winds of Truth it states that the only threat to retribution was Hoid but also Nightblood could kill a god and so I got thinking and with Hoid having all the powers he does plus being a dawnshard, what would happen if Hoid also got Nightblood and how much more chaos could he create.
I forgot to mention, this is all theoretical because of him holding the bind dawnshard making him unable to harm others to the extreme that he has to go vegetarian.