Impure Phlogiston Development Materials A basic material used to break through weapons and upgrade skills for Pistols Resonators.

A crystal shaped like a solidified flame. Its unconventional appearance challenges Old Science. Typically, it contains a rather high level of impurities and thus requires specialized purification treatment for practical use.
Sources
Garden of Confession
Synthesis - Transposition
Forgery Challenge: Marigold Woods
Souvenir Store
Weapon Shop