Resonators Monsters Weapons Items
MF Polygon Core Development Materials A material used for Weapon & Resonator Ascension and Skill Upgrade.

A common polygonal Tacet Core with an intricate, terraced pattern. The spiral structure is fairly complete. Seems to be an analog circuit recording the behavioral patterns of a Tacet Discord.
Sources
Synthesis - Purification
Synthesis - Transposition
Drop: Clamorlings or Tranquilites