Ghost Or Poltergeist

I've been chased by things almost formless in a void fertile only with horror; bodies made of black energy, burnt roots, twisted wire- invisible to all but psyches eyes. No speed can shake them off no devotions dislodge them; and left behind, a feeling of filth, as nerves crawl restlessly, the only rooted memory. Whether they died or ever breathed at all doesn't really matter; they can keep running till time itself runs out and are far too intelligent to be called merely ghost, or poltergeist..