Resonators Monsters Weapons Items
HF Tidal Residuum Development Materials A material used for Weapon & Resonator Ascension and Skill Upgrade.

A robust formation resembling a sailing ship, occasionally found on certain Tacet Discords in Rinascita. Legend say Tacet Discords with this Residuum can hear the distant echoes of the Dark Tide.
Sources
Synthesis - Purification
Synthesis - Transposition
Drop: Tacet Discords influenced by the Dark Tide