Flawless Phlohiston Development Materials A premium material used to break through weapons and upgrade skills for Pistols Resonators.

A crystal shaped like a raging flame, known for its impeccable purity. As a result, some Resonators don't want to use these crystals solely for enhancement, instead opting to entrust professional craftsmen to process them into unique accessories.
Sources
Synthesis
Forgery Challenge: Marigold Woods