FF Polygon Core Development Materials A material used for Weapon & Resonator Ascension and Skill Upgrade.

A robust polygonal Tacet Core with an intricate, terraced pattern. The polygonal structure shows a tendency to expand outwards, likely because of the lack of capacity for storing the growingly complex logic in the behaviors of a Tacet Discord.
Sources
Synthesis - Purification
Synthesis - Transposition
Drop: Clamorlings or Tranquilites