Hellfire Warlock

The Hellfire warlock is a prestige class to be introduced with Storm of Zehir.

Description
The hellfire warlocks are a secretive group of specialist warlocks who have mastered hellfire, a dangerous energy found only in the Nine Hells. By tapping into this infernal power, these characters learn to infuse their eldritch blasts and magic items that they wield with the dark power of hellfire.

Prospective hellfire warlocks must fulfill strict requirements to gain entry to the class, making this prestige class exclusive to warlocks. While most characters who pursue the hellfire warlock class are otherwise single-class warlocks, multiclass warlocks with wizard levels are also common. Multiclass warlock/rogues, warlock/clerics, or even warlock/fighters are also possible, but entry into the prestige class is restricted until higher levels.

Requirements
Skills: Intimidate 6, Lore 12, Spellcraft 6

Spellcasting: Must have Brimstone Blast or Hellrime Blast

Hellfire Blast
Whenever you use your eldritch blast ability, you can change your eldritch blast into a hellfire blast. A hellfire blast deals your normal eldritch blast damage plus an extra 2d6 points of damage per class level. If your blast hits multiple targets (for example, the eldritch chain or eldritch cone blast shape invocations), each target takes the extra damage. This damage is not fire damage.

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.

Invocations
At each level, you gain new invocations known, increased damage with eldritch blast, and an increase in invoker level as if you had also 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
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
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 metamagic effects to your next use of the item: empower, enlarge, widen, or energy substitution. These effects work just like the metamagic 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. This 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 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.