Alignment: Chaotic
Movement: 90' (30')
Armor Class: 2
Hit dice: 11 to 18
Attacks: 2 to 3 (12 and up)
THAC0: varies
Damage: 1d8+6 to 1d8+8
Save as: Fighter 11 to 18
Morale: 10
Before you stands the dullahan, a fae of the unseele court, dressed in finest black and red. A creature of almost unsurpassed evil, gleeful in the death and terror it sows. In it's left hand it holds a whip made from the spine of a mortal man it murdered, in its right, its own severed head. And on that severed head is a wicked grin from ear to ear, as if this thing cut the vile grin its self. Behind it stands its hellish steed. No, not hellish steed, for Hell its self would not dare to call such a beast and its rider their own.
Dullahans, or headless horseman, are vicious and sadistic unseele fae. They delight in the hunting and slaughtering of their fellow sapients stopping only at members of their own. They ride in the dark and cold, drawing behind him an elaborate morbid carriage. In battle and in horseman ship they wield whips made from human spinal cords. These whips are in turn twisted by the dullahan's own mystical nature into potent magical weapons. They either function as +3 wounding whips or a +5 wounding and crippling whips as long as the dullahan weilds them. It takes +3 or greater magical weapons to harm them.
The power of the dullahan cannot be restrained or contained. All locks will fall away and all physical barriers are useless against them. On other words dullahans can cast knock and demension door at will. Being the great headsmen and horsemen of the Unseele Court dullahans are masters of stealth and expert climbers. This means they can move silently, hide in the shadows and climb sheer surfaces as a thief equal to their hit dice and can freely share these skills with their mounts. These headless riders can even hear beating of a man's heart a dozen yards away, granting them hear noise as an equally leveled thief. Dullahans can also backstab just like thieves.
On top of all this is the dullahan's most dreaded power, the power to kill with but a word, their victim's own name. Treat this as power word kill 1/day, but the dullahan must identify their victim and know his or her true name. However even the dullahan have one fear, gold. It burns their flesh and they hold no power over it.
Dullahand's horse
Treat normal dullahan mounts as hell hounds with the following changes. One, they're horses, not giant dogs. Two, instead of breating fire dullahan mounts breath a cold black mist from their mouths.
So here's the dullahand, a particularly wicked fae from Irish myth just in time for Halloween. I'll fix any typos I made later.