After a long absence, I am returning to Pathfinder and am a little rusty. I need some help building an antagonist for my new campaign.
She's an elven Nocticulan assassin who specalizes in killing mages and who is going to be a constant terror for the Alliance Mage Corps in the city that my players are going to be in. However, Im at a loss on how to build her. I know I want her to be Level 12, but am not sure of class or fighting style. I was thinking either Slayer or Vigilante, as goining undetected between kills is a big thing for her. So I ask the optimizers here, what can I do to make this lusty, stabby elf girl a terror to remember?