So I was looking at the sidebar on p. 30 of the GM kit regarding giving nemesis NPCs XP and the means for leveling them. My first idea for this especially since the ability to level the nemesis can get pretty high skilled by the RAW there was to chargen the nemesis as if I was creating a PC. They wouldn't be very highly leveled to begin with when the pcs first encounter them, but I imagined that they would be more and more of a challenge with each recurring appearance.
I like that aspect but was wondering when buying into the Adversary talent (at a cost of 40 XP per rank as it is not found in any Specialization) should be timed. I'm thinking that having one rank early on would help show their special status as a villain to the party, but then I was wondering when re-buying into that talent would work best. I want to be careful not to repurchase that talent too much as havering an NPC with too high of a rank in Adversary would unbalance the game too much against the party.
What would be the max end of Adversary ranking then?
Also, some skills (from the perspective of an NPC nemesis) seem like they might not be useful to buy into. Has anyone looked at this or am I just not thinking of scenarios where I would need to have an NPC make Knowledge checks? I know that there are some NPCs listed in the Core and other books with some skills that are not social/combat skills and I'm wracking my brain to come up with situations when I would have to perform that sort of check for an NPC, so any help here would be greatly appreciated.