The official rules are that the size of the caster has no effect on the spell.
I note that size has a varying effect on weapons, with their damage increasing and decreasing as the creature enlarges or shrinks. But I noticed that spells remain the same even if cast by a Tiny or Diminutive creature. I find this strange that at least the range or area of effect does not change. Is there any official rules regarding size on spell effects?
Been using following:
Fine: one third range and area of effect
Tiny and Dimunitive: one-half range and area of effect
Small, Medium, Large: no change
Huge and Gargantuan: double the range and area of effect
Colossal: triple the range and area of effect
Why?
Why not reduce/increase damage done? Like weapons.
Why not increase/reduce material components required too?
Why not increase/reduce number of spell slots required?
Why not increase/reduce spell durations, or # of targets, or casting time too??
I mean, why not?
Because unlike swinging a weapon, it's not the muscles that are doing the damage, it's the power of the magic. Especially for divine casters, the power comes from somewhere else.
Why?
Magic utilizes the mind. You're tapping into power using faith, cognition, and/or force of personality. If any supernatural ability relies on a physical characteristic, size bonuses to ability scores already account for this. For example, the Dex bonus from reduce person will help you aim better with scorching ray.
Why not reduce/increase damage done? Like weapons.
Weapons increase/decrease in damage because the weapon is getting bigger/smaller. A bigger weapon does more damage. This isn't true for spells because their power increases with caster level, not with size.
Why not increase/reduce material components required too?
Increasing/decreasing the size of material components do not change their value because size changing magic is not permanent.
Why not increase/reduce number of spell slots required?
Your mental capabilities determine your spell slots. No, making your brain bigger doesn't make you smarter. If it did, enlarge person would give you an Intelligence bonus.
Why not increase/reduce spell durations, or # of targets, or casting time too??
Again, spell durations and targets are determined by caster level -- which represents the power of the spellcaster. The only time caster level is determined physically is if a creature has racial HD. Even then, HD represents far more than physical power.
And I don't see why making you bigger or smaller would change casting time. The spell determines the casting time, nothing else.
I mean, why not?
Because size already confers many benefits relevant at all levels of play.
Because big monsters have high HD, and HD determines caster level for creatures capable of spellcasting without class levels. And the potency of spell variables is determined by caster level. Thus, a monster's size already determines spell variables.
Because spellcasters are already very powerful.
Because it would make size magic more complicated.
Because it would encourage spellcasters to buff themselves rather than their party members.
Because size affecting casting time would break the action economy.
Psst. Cyrad? I think Remy was being sarcastic. :)
Psst. Cyrad? I think Remy was being sarcastic. :)
Oh, I think I just botched my Sense Motive check.