Inside The Ruin
Wraith looks almost the same as Ghost. They are Supernatural with an almost transparent form but dark in color like heavily polluted air or sometimes appeared in thick black smoke form.
Wraiths are much stronger than Ghosts because they are formed from humans or other creatures that die on the spot with great Magic energy. That information is known only to Supernatural Hunters.
The cause of the creation of Wraith was because the souls of humans or other creatures were affected by Magic energy. And the ruins from The Great Supernatural War must have quite a large amount of Magic energy residue.
Judging from the number of Wraiths that appeared at once, they were indeed created from a large source of Magic energy. Because their bodies are transparent, only magic attacks can affect them.
They do not have complete legs and only move by hovering above the ground.