Assassin

The assassins are a clan of superior killers mostly using stealth, the darkness is literally their best friend. If you've got a contract you want to be put out on someone they're the ones you need to contact to do so. When they get a contract they don't tend to stop hunting after them until the kill is confirmed, if you don't pay them, you're next on their list.

They have a +3 stealth bonus, as well as a +5 stealth attack bonus. 

Level two assassins gain spells Night Vision and echolocation

Level three assassins gain the spell shapeshift

Starting at level four every other two levels an assassins proficiency bonus raises by 1 point (Stealth would become a +4, Stealth Attack would become a +6)