apsuman said:
Two things
First, As I understand Arcane Fire: The character has to permanently lose one ninth level spell slot to acquire this feature. For the cost of that spell slot, however, a wizard character can say I know I memorized Ray of frost in a level zero slot but instead I will use that spell to power a level zero arcane fire bolt, and do 0d6 + 1d6 for each archmage level. Since the sorcerer does not have to memorize spells he simply decides in the moment that he will take any onf of his level (fill in the blank) spell slots and instead use arcane fire. I think this is what you are saying in your post but I am unsure.
Second:
What the #$%^! do you mean that arcane fire is not (easily) metamagiced?
I know of no way to make arcane fire metamagiced. Please explain this whole "(easily)" thing.
Yes, taking Arcane fire will remove permanently one 9th level slot from the caster. This is still no big deal for sorcerer, as he will have 5 slots left at 20th level, before counting bonus spells from high stat.
For wizard, it is bit tougher decision, but still worth it IMHO, as he will gain ability to change in the fly any memorized spell to a quite reliable damage spell.
Uhm. You lose 9th level slot for this ability, but thats it. After that, the caster (wiz/sorc) just can say that "I use arcane fire" and then pick ANY ONE spell / slot he has not used that day and use that to power the bolt. Ie, take a 20th lvl wiz or sorc in the morning, with all spells/slots just refreshed. Now, the wiz or sorc can proceed to use Arcane fire with all spells/slots that he has.
A wiz could make 4 bolts with 0th lvl spells, 4 bolts with 1st lvl spells, ... , 3 bolts with 9th lvl spells. (Of course, 1 bolt/round)
The sorc could do the same, but 6 bolts with 0th lvl spells, 6 bolts with 1st lvl spells, ... , 5 bolts with 9th lvl spells. (of course, 1 bolt/round)
Wizard or sorcerer can use only one spell/slot to power the bolt. Ie, assuming 5th lvl archmage, using 0th level memorized spell (wiz) or 'memorized' slot (sorc), the bolt will do 0 + 5d6 damage. Using 8th lvl spell(wiz)/slot(sorc) will make the bolt do 8d6+5d6 damage. Ie, wiz and sorc work exactly the same, except that wiz uses memorized spells when sorc uses memorized slots.
Lastly, I am sure that there are several feats that 'metamagic' Spell-Like Abilities. But I also recall that there was some feats that modify supernatural abilities too. I don't have books here though. Some books that could be worth checking are Savage Species, Monster manual I, II and Fiend Folio.