Ok, scratch the monk.
Hellfire Warlock is a Prestige Class found in the Fiendish Codex II. It has a maximum of 3 levels. Listing for your approval.
Hellfire Warlock -- Hit Die D6
1st BAB +0, F+0, R+0, W+2, Hellfire Blast +2d6, +1 Lvl of existing Invoking Class.
2nd BAB +1, F+0, R+0, W+3, Hellfire Blast +4d6, Hellfire Infusion, Resist Fire 10, +1 Lvl of existing Invoking Class.
3rd BAB+2, F+1, R+1, W+3, Hellfire Blast +6d6, Hellfire Shield, +1 Lvl of existing Invoking Class.
Same skills and skill points as Warlock.
Requirements: Skills -- Intimidate 6 ranks, Knowledge the planes 12 ranks, spellcraft 6 ranks. Language -- Infernal. Warlock Invocations -- Must know Brimstone Blast or Hellrime Blast.
Hellfire Blast (Sp):
Whenever you use your Eldritch Blast, you can change your Eldritch Blast into a Hellfire Blast. Hellfire Blast deals your normal Eldritch Blast damage plus an extra 2d6 points of damage per class level.If your blast hits multiple targets (ex: Eldritch Chain or Eldritch Cone Blast Shapes), each target takes the extra damage. This damage is not fire damage. Hellfire burns hotter than normal fire.
[SBLOCK=Hellfire Rules]
Hellfire is the creation of Mephistopheles, archduke of Cania. Hotter than the hottest flames of any world, hellfire burns with a white-hot glow and is capable of burning through even the hardest of substances. Hellfire does not deal fire damage despite its flames. Even creatures with immunity or resistance to fire take full damage from these hellish flames. Hellfire also deals full damage to objects, unlike normal fire damage. [/SBLOCK]
Each time you use this ability you take 1 point of Constitution damage. Because the diabolical forces behind the power of hellfire demand part of your essence in exchange for this granted power, if you do not have a Constitution score or are somehow immune to Constitution damage, you cannot use this ability.
Invoking:
At each level, you gain new invocations known, increased damage with Eldritch Blast, and an increase in invoker level as if you had gained a level in the Warlock class. You do not, however, gain any other benefit a character of that class would have gained.
Resistance to fire 10 (Ex):
At 2nd level, you gain resistance to fire 10. This resistance stacks with any resistance to fire you have gained from Warlock class levels.
Hellfire Infusion (Su):
Starting at 2nd level, you can infuse magic items that you wield with the power of hellfire. Whenever you use a charged magic item (such as a Wand or a Staff), you can apply one of the following meta magic effects to your next use of the item: empower, enlarge, widen, or energy substitution. These effects work just as the meta magic feats of the same name. Using Hellfire Infusion is a swift action. You can use this ability a number of times per day equal to your Charisma modifier (minimum one). When you infuse an item with hellfire, it glows briefly with fiery symbols that are disturbing to look upon.
Hellfire Shield:
Starting at 3rd level, you can call up hellfire to surround yourself with a protective barrier. Whenever someone directs a melee attack against you, you can, as an immediate action, aim a blast of hellfire at that creature. The blast deals damage equal to your Eldritch Blast (including bonus damage from the Hellfire Blast ability). This blast automatically strikes the target, which can attempt a Reflex saving throw for half damage (DC 10 +1/2 your character level + your Cha modifier). Each time you use this ability, you take 1 point of Constitution damage. Because the diabolical forces behind the power of hellfire demand..... See Hellfire above. This took a long time to type
WarShrike
