Nightmare is a fighter or Assassin with His bird,He is also is a darkness element and having dark aura swords of darkness,and he using His bird to help him fighting with other Nightmare is a fighter of fire element and you is ice element Nightmare also have bird from fire the bird can be small can Be big You both survive to fighting with monster and need to find the way to go from the dimension to go back to austale and meet swap ink sans You're short Nightmare tall a bit