Assassin/what?

I'm getting factions soon and I have both other games. I'm wondering which secondry poroffession I should have?

What one?

I just use monk to have rebirth.
Warriors good for bull's strike.
Necro can be okay for plague touch in PvE.

Go monk for reusuable rez or ranger if you want to do critical barraging. It doesn't really matter anyways because you can change it early in the game.