Impure Phlogiston Development Materials A basic material used for Weapon Ascension and Skill Upgrade 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
Forgery Challenge: Abyss of Confession
Synthesis - Conversion
Forgery Challenge: Marigold Woods
Souvenir Store
Weapon Shop