Giving this a revisit, I'm not sure if Frank and K had done the Tome of Fiends before I wrote this, so I want to try using those rules for it, might work a bit better.
Hell Rider
Once in a while, Mephistopheles will make a faustian pact with a mortal. In this pact the mortal is turned into a Hell Rider, a sort of Infernal bounty hunter wielding pure Hellfire. In return, the mortal will get whatever it is mortal's want, money, love, the life of a love one saved from some horrible disease, or some other thing that could just as easily be obtained with the proper spell from a cleric or wizard.
Requirements
skills: Ride or Drive 9r, Kn (the Planes) 6r
Base Ref Save: +4
Special: Must make a pact with a devil (of no less rank than an Imp) to be their bounty hunter.
Game Info
HD: d8
Good Ref
Good BAB
Skills(6+int): Bluff, Control Shape, Diplomacy, [Drive], Handle Animal, Intimidate, Kn. Arcana, Kn. Religion, Kn. the Planes, Move Silently, Ride, Sense Motive, Spellcraft, Use Magic Device
Lv Special
1st The Contract, Hell Rider Persona, Alternate Form, Hell's Mount, Penance Stare, Hellfire Sphere (Basic)
2nd Hellfire Infusion
3rd Hellfire Sphere (Advanced)
4th The Long Ride
5th Hellfire Sphere (Expert)
Weapon and Armour Proficiencies: The Hell Rider gains proficiency in all chain weapons, longsword, and lances. He also gains proficiency in leather, studded leather and brigandine armour(Oriental Adventures).
The Contract: Once a year, the Hell Rider must track down a bounty for his fiendish patron. In addition to capture of a person, this bounty can take many other forms. It can be assassination, recovery of an item, destruction of an item to keep it from enemies, or any single service, really. Usually this service is one that requires the Hell Rider's personal abilities, and is seldom (but occasionally) frivolous, as the patron can only do this once per year.
This ability functions as the feat Evil Brand at all times, and while pursuing a bounty, no devil of lesser rank than the Hell Rider's master may interfere with the task.
Hell Rider Persona: Each Hell Rider has a persona, influenced by their mundane personality and mental abilities.
Hell Riders whose highest mental stat is Intelligence are known as Schemers.
Hell Riders whose highest mental stat is Wisdom are known as Cunning.
Hell Riders whose highest mental stat is Charisma are known as Impressive.
A Hell Rider gains a +1 bonus to all skills dependent on the ability score of his Persona and the DC of his Penance Stare, and the base DC of his Penance Stare is based on the ability score of his Persona. This bonus becomes +2 at third level, and +3 at fifth.
Alternate Form (Ex): At night, the Hell Rider is affected by a terrifying transformation into an image of hellish death. The skin of his head and hands burns away to reveal bone wreathed in hellfire, and his clothes take on a more menacing appearance(metal studs become spikes, the clothing becomes darker, etc.). This transformation has no mechanical effect, except to give studded leather armour spikes (happy birthday). In this form, the Hell Rider gains profane bonuses of +6 str, and +4 con, a deflection bonus to his armour class equal to 1/4 his character level, and immunity to fire and hellfire. He also gains a hellfire aura that functions as the burn ability of the fire elemental, except that it deals hellfire damage rather than fire damage. The Hell Rider cannot maintain this alternate form in direct sunlight, and reverts to his normal form at daybreak. He may still assume the form in shadow (or otherwise outside of direct sunlight) during the day with a successful Control Shape check (DC 20). Control Shape can also affect this ability in all ways as it does the lycanthrope ability of the same name, treat this form as an 'animal' form, and use the delineation of night and day rather than moon phase.
Hell's Mount (Ex): Any vehicle piloted by or mount rode by a Hell's Rider is possessed by a diabolical steed spirit that is loyal to that Hell Rider. Once possessed, it is affected by a transformation similar to the Hell Rider's alternate form, it is left skeletal and wreathed in hellfire. This aura of hellfire gives the steed the fire and hellfire immunity and hellfire burn ability of the Hell Rider's alternate form. The spirit can animate objects it possesses, and it has an intelligence score of 3. It can be trained with Handle Animal as if it were a magical beast, but already knows the command "heel". The vehicle or mount can travel indefinitely without need for rest, food/fuel, or healing/repair so long as it is taking at least a double move action, and does not suffer non-lethal damage from extended hustling, running or forced march. The Hell's Mount can travel upon any surface at normal speed, at any angle(Air is not a surface, but water is, as are clouds). The mount and Hell Rider share an empathic link. Whether possessing a creature or object, the spirit has HD equal to it's master's level-2, the Outsider (Evil, Fire, Lawful) type, and strength equal to the creature's plus the master's class level (base 20 if an object). While possessing an object, it gains 5 bonus hardness(min 10) and 15 bonus hp per master class level, both types of mount gain an additional 50% speed per master class level. The Hell's Mount of a 3rd level Hell Rider has spell resistance as the special mount of a paladin of the master's character level, and a fifth level Hell Rider's Hell's Mount can command devils.
Penance Stare (Su): You can, at will, as a full round action gaze into a person's eyes, and reflect in your own their every sin and misdeed, while they are compelled to simply stare and watch as the events replay and they feel all the pain they've ever caused amplified ten fold. The target is affected as if by the spell Enervation, The target gets a save (DC = 10 + 1/2 Char lvl + Persona Stat + Persona Bonus) to only take half damage. Neutral targets take a -4 penalty this save, and evil characters take a -6. The target always takes 1 negative level, this single neg lvl is not a spell effect but an effect of Penance Stare, and all negative levels caused by the enervation effect are in addition to this one. Penance Stare is a gaze attack but with a range of touch (touch is not actually required, but the target must be within your reach). Perversely, this effect heals Undead (just as Enervation does), possibly because they are so fueled by the pain and suffering they inflict.
Hellfire Infusion (Su): As a move action, you may wreath a weapon in hellflame. In this state, the weapon does an extra 1d6 points of damage per three character levels, minimum one. All damage dealt by the weapon is Hellfire damage. Hellfire damage is identical to fire damage except that it bypasses fire immunity.
This same ability can be used on damaging spells with the following changes: Instead of a move action, the spell's casting time is increased by one step, from swift to standard, from standard to one full round, from a full round to one minute, from one minute to ten minutes, and from ten minutes to a ritual lasting one hour; Instead of dealing additional damage, the spell's damage bypasses fire immunity, effectively becoming hellfire damage. Finally, the spell's level is increased by the Hell Rider's class level for purposes of the DC, and his class level increases his caster level for that casting of the spell. A weapon created by a spell or other magical effect is treated as a normal weapon for the purposes of this ability.
The Long Ride(Ex.): A Hell Rider traveling on his Hell's Mount has no need to eat, drink, or sleep. This ability functions even in direct sunlight so long as the journey began in shadow or at night.
Hellfire Sphere
Granted Ability: Fire damage from your spell like abilities overcome fire immunity but not resistance.
1st: Produce Flame
3rd: Scorching Ray
5th: Burning Blood (Drac.)(deals fire damage, no need for a breath weapon, functions in alternate form with no problem)
7th: Wall of Fire
9th: Charnel Fire (BoVD)
11th: Firestride Exhalation (DrMg)
13th: Fire Storm
15th: Glorious Master of the Elements (DrMg) (Fire only)
17th: Incendiary Cloud
19th: Storm of Vengeance (All elemental damage is Fire)
right, so how's this version look?