The lobster was injected with a plant toxin. The toxin was extracted from a type of flower called poppy. Those flowers were commonly seen in the border area between Province Yun and YN. It was also possible to see farmers planting them in large areas in small countries like MD Country. However, it was prohibited to plant poppies privately in the country. Even if pharmacists wanted to grow it for medical purposes, they had to apply and go through strict checks and approvals.
The flower was poisonous in all its beads. Its roots, stems, and seeds were highly poisonous. However, more traders extracted the poppy's poison for profit rather than medical purposes.