Board Thread:Off Topic/@comment-26064215-20150127201253/@comment-25857155-20150222022132

Gravity Dust, I imagine, would use Dark and Earth dust in combination, assuming Dark dust were to work the way I imagine it. But I don't think I've heard of a Gravity Dust in canon any more than I have heard of Dark Dust. I suspect they use Earth and Fire Dust to reach a higher velocity and impact. I'm not sure about that Dark effect you mentioned, though.