Firebiter poison is a forbidden contact poison with a bitter odor and a yellowish tint. It causes unpleasant effects upon contact, making it highly dangerous and illegal. The poison is typically formulated as a tincture and is associated with nefarious activities.
A thick black hemp bag coated in Firebiter poison was discovered hidden above the ceiling of the Crane couple's quarters during an investigation. Kakita Kazumi identified the bag's coating as a mild tincture of Firebiter poison, consistent with the symptoms experienced by Shiba Midori. The bag was slick to the touch, and precautions were taken to avoid direct contact with the poison.