Nightmare

Nightmare (originally Saichasika) is a fire-elemental dragon and one of Ichiro's many dragons. It was only used once as an ambush by Ichiro in the battle against Hikaru Himuro. It later defeated Hikaru's Dragon Kokao but later was showing that the Kokao is an illusion since the very begining and the real one which hiding at behind since begun were defeated Nightmare as well. It has an alien-like appearance.