Theory

out-there-on-the-maroon:

Look Tary is shaping up to be a lovely little goofy nerd and I hope that’s the truth. But I still don’t trust him at all and that’s not gonna change for a while. 

Yes he seems like a harmless buffoon. But this is Sam. Sam is smart. Maybe Tary isn’t smart, but Sam is. And after the shit Sam pulled I don’t trust him at all. 

So if Tary is evil … what’s his goal? I’d say the most likely thing is Percy’s guns (har har), or the death orb under Whitestone. 

Guns seem most likely. Especially since it increasingly sounds like his dad is part of the Wildmount mafia or something. Perhaps they’ve heard of the strange new weapons and want some for themselves. So they send Tary out to track down these adventurers with the strange weapons, and steal the designs. 

Unfortunately for them, Percy doesn’t keep notes on the guns and periodically burns them. So Tary will have to get close to Percy and learn how he makes them in a hands-on demonstration. 

And what did Tary do last game? Spend days and nights in a workshop with Percy, tinkering. Designing things with him. Getting a good look at his guns and how they work. 

I gotta wonder if, after Vex and Percy kicked him out, Tary raced to his own cabin, locked the door, and said “Doty, take this down …”