What is a lore accurate build for nemesis?

Hm…

Obsession build, I think. Nemesis is deployed into an area with specific targets that he hunts relentlessly no matter what. I think he'd have perks for sticking on specific survivors.

Maybe some perks like Game Afoot, Nemesis (lol), and Rancor? Plus Lethal Pursuer from his own teachables to help get into the first chase with the Obsession quicker.

You could sprinkle in some stuff like Machine Learning and Fire Up to represent him adapting as the trial goes on, if you want to get fancy with it.

You're allowed to do whatever you want.

If you want to make things more fun, though, something like Play With Your Food would allow you to chase other survivors without losing thematic cohesion. Same for Obsession swapping perks, but those lose a little thematic cohesion.

I like to use vecna's exhaustion perk to make him feel more relentless in chase, removing the option of holding w

Lore accurate…

So this one is "almost" always knows where you are - Info\aura reading perk + Lethal Pursuer.

He's very resilient, nearly unstoppable, pretty fast, very strong, and smart "enough" - Enduring, Spirit Fury, Superior Anatomy, Fire Up, Agitation\Iron grasp.

He obsessed with Stars members - Obsession related perks + Rancor.

Mash how you like, you got the point.