Sasin

almost an assassin. The person has insane skills, cool weapons, and stealth, however they refrain from killing.

Did you see that Sasin B-ama? She's got mad skills and a chain whip! We might get sasinated.

sasinate

The art of causing others to be fearful/shocked/in awe just by performing the insane skills usually associated with an assassin minus the killing. This term is usually associated with the 'Sasin'.

Oh wow, look over there, that Sasin can sure sasinate! That innocent crowd of bystanders are completely amazed.