The Gray Demons (灰色の魔神, Haiiro no Majin) (alternatively, the ashen-gray demons (アッシュ, Asshu)) are a class of demons, stated to be a higher being than the Red Demon. The corpse of a demon was used in Hendrickson's experiments. At some point of time, a Gray Demon was killed by an unknown individual of great power as it is shown to have died from a large slash wound in the chest. It is shown to have participated in a war between its Clan and the Four Races.