An evil substance primarily found beneath the soil of Dark Island. Dark matter resembles purple mud in its natural state, but turns black when refined. A very small amount of it can completely corrupt someone, and the Overlord himself once called it “concentrated evil.” Garmadon used this substance in his Garmatron machine, as well as to turn Nya bad.

Ninja Dojo
Elemental Blade
4.5 Bricks
Inventing Gadgets