Blatta Pulvereus

Blatta Pulvereus is, likely, an ingredient used in potion-making. Based on its etymology, it might be, or contain, pulverised cockroaches or other insects.

Etymology

 * "Blatta" is the Latin term to refer to lucifuge insects: any insect that shuns the light, such as cockroaches, Moths, or bookworms, although it specifically refers to cockroaches in the Italian language.
 * "Pulvereus" is the Latin root of the modern English word "pulverised".