Given your level, you'd be far better off trying to get it from one of the Doom Soldiers in Cape Teriggan. While they're undead (and as such you couldn't Drain them for HP), they're going to, at most, be even match to you. The two NMs you mentioned though are in the low 70's, which already puts them higher level than you even before taking into account that they're NMs.
Lady Jinte wrote:
Vlorsutes' Negotiation Skill rises 0.2 points
Vlorsutes' Observant Parent Skill rises 0.3 points
Vlorsutes' Argument Diffusing Skill rises 0.1 points