So Velturin was an assassin who killed every target assigned to him. Then one day he disappeared. People would pay dearly for the set of assassination tools he wore as a uniform. What if you got a bead on where he might be? What if some others did as well? What if he was not actually dead?
Here are ten great enchanted items to make any assassin in your game more scary (especially as a set, but even one or two would do.)