Jessamine

Jessamine, a female Chultan human and former assassin, doesn't speak often. When the council finds itself divided on an issue, however, Jessamine usually casts the deciding vote. Most of her body is hidden under billowy robes and tightly wrapped black bandages.
Jessamine trades in plants, herbs, poison, and sanctioned assassination. Murder is illegal in Port Nyanzaru, as it is almost everywhere, but Jessamine has a monopoly on "sanctions"—writs that allow a killing by ordained methods (usually poison or stabbing with a blade). For an added fee, her agents will carry out the assassination, with results guaranteed. Poison is her specialty, and she has a vast personal collection. She sells all the poisons listed in the Poisons table in chapter 8 of the Dungeon Master's Guide at market prices.