Don't Mess with Me, I'm Afraid of Being Poisonous

In the world of cultivating immortals, the weak eat the strong. There are many sects and monsters are rampant. The heroine has her own dual cultivation system of medicine and poisoning + portable space (growing elixirs + hiding poisons). In her previous life, she was a doctor of toxicology in a medical school. She cursed every day, but she saved people when she needed to and never showed mercy when she needed to poison.