the planar infusion feat gives u the ability to do hellfire damage but does that work with spells also ? and what does hellfire do?
Hell (Outer Plane (Lawful Evil))
Basic Hell’s influence grants you a silvered tongue and bolsters your arrogance. You gain a +1 bonus on Will saves, a +2 bonus on Bluff checks to lie to or fool someone, and a +2 bonus on Diplomacy checks to adjust a creature’s attitude.
Improved Whenever you deal fire damage, you can instead deal hellfire damage (see below). Secondary fires lit by your initial fire attack deal normal fire damage (including burn damage, if such damage occurs).
Greater You can inflict the agonizing pain of eternal damnation on the masses for a brief instant. You can use mass inflict pain once per day as a spell-like ability.
i don't know where you looked up the feat. but the in the archive of nethys the feat explain what hellfire is:
Basic Hell’s influence grants you a silvered tongue and bolsters your arrogance. You gain a +1 bonus on Will saves, a +2 bonus on Bluff checks to lie to or fool someone, and a +2 bonus on Diplomacy checks to adjust a creature’s attitude.
Improved Whenever you deal fire damage, you can instead deal hellfire damage (hellfire damage is half fire damage and half damage from unholy energy; evil-aligned creatures and creatures with the evil subtype take no damage from the unholy energy, but goodaligned beings and those with the good subtype take double the normal damage from it. Creatures under the effects of spells such as protection from evil are unaffected by this unholy energy, though they are still subject to the fire damage.). Secondary fires lit by your initial fire attack deal normal fire damage (including burn damage, if such damage occurs).
Greater You can inflict the agonizing pain of eternal damnation on the masses for a brief instant. You can use mass inflict pain once per day as a spell-like ability.
it say whenever you deal fire damage. so i guess spells included (not secondary fires lit by that though)
what about neutral creatures do they take the damage ?
good take double of unholy damage. evil take no unholy damage. neutral take normal (left unchanged so unchanged).
a fire spell that should deal 20 fire damage would deal in hellfire mode as such:
good target: 10 fire + 20 unholy damage.
evil target (or some1 with protection from evil): 10 fire.
neutral target : 10 fire and 10 unholy damage.
oh ok that was helpful