Black Matter is an enemy in Octopath Traveler.
Two are summoned by Mattias during Chapter 4 of Ophilia's story when he uses Mattias summoned help! and after the Senior Cultists have been summoned and defeated.
Battle
- Attack: Physical attack, single target.
- Black Magic: Elemental damage, . Targets entire party.
- Shadow Strike: Elemental damage, . Single target.
- Dancing Shadows: Elemental damage, . Targets random allies. Hits 4 times.