An Unusual Strike

Really Short

My true name is known to no one, so I see no reason to tell you. My gang name, on the other hand, is known to all… Poison Thorn (PT for short). I discreetly become a thorn in my enemy’s foot, making even the steadiest mind nervous; then I use my “poison” to kill, capture, or even control my target. I always get my man; makes me the most elite assassin.

All the leaders want me but I won’t serve anyone except the Silver Rose clan. They made me into what I am and only they can control me. A Thorn is always connected to the Rose. Unless someone breaks it off, but if they do then the thorn will die.
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This one is REALLY... SHORT.

(Why do we kill people who kill people, to show people, that killing people is wrong?)