Spell Radius and Large+ Creatures

[Vahktang]

Fireball can't fit, so extra save?

Well consider the fireball, or better yet the flame strike.
You can't get to the center of the colossol target, so, what 1/2 damage? Extra save?

No wonder the Tarrasque is so hard to kill.

 

[frankthedm]

Well consider the fireball, or better yet the flame strike.
You can't get to the center of the colossol target, so, what 1/2 damage? Extra save?

I'd be for that. If a meduim PC gets various considerations because he does not fill his 5' are completely, the bigger monsters deserve similar considerations! But the current rule set just requires a single square to be fully affected.

No wonder the Tarrasque is so hard to kill.

Actually it’s tough because
It regens fast
Is fire immune
Has almost 900HP{and does if the DM switches just one toughness for improved toughness.]
Is a grapplin’s machine that can afford to take the -20.
Has DR that you have to have an epic weapon or +4 Magical Beast Bane weapon to overcome.
All cones, rays, lines and Magic Missiles bounce off it, sometimes nailing the caster
A 20th level caster has a 45% chance to get through it’s SR.
Can get a 150’ speed burst / +48 jump boost once a minute.
Costs XP to kill.

 

[robberbaron]

No; the point of origin is always a grid intersection.

If a medium-sized speller casts a magic circle on himself from where does it originate?

1. From the centre of his square, making the size 1½ squares away from the edge of his square in all directions?
2. 10' in all directions from the edge of his square?
3. 10' in all directions from a specified corner of his square?
or 4. Something I haven't considered?

 

[Drowbane]

If a medium-sized speller casts a magic circle on himself from where does it originate?

1. From the centre of his square, making the size 1½ squares away from the edge of his square in all directions?
2. 10' in all directions from the edge of his square?
3. 10' in all directions from a specified corner of his square?
or 4. Something I haven't considered?

Grid intersection. Choose a corner and put an X at that corner. 10ft in all directions from that spot.

 

[BASHMAN]

This came up once in our epic game. We were fighting several collossal blue dragons. After ripping them new ones, about half managed to flee to saftey by force-caging me (it took me a round to get out with a miracled disintigrate) and flying at top speed.

Later they came back for us, surrounded by anti-magic fields. Immediately, the wizard said that they could not possibly be covered by anti-magic field, as the spell is only a 10' area, and they were each much, much larger than this. The DM stated that they had each cast it multiple times.

That worked out just fine for us, because this meant that there were multiple chances per dragon that the wizard's Disjunction would cause one of the fields to fade away, giving us our opening. Unfortunately, we ended the session at that point, before the disjunction was cast, and we never picked up that fight again. Fooey.

 

[Ogrork the Mighty]

See, in that type of situation, I'd just rule-zero it and give the dragons a 5- or 10-ft. radius. It might not be in the RAW, but it makes more sense to me than to get into rules debates about why the dragon can't benefit from such a spell just b/c he takes up more spaces.

 

[The_Ditto]

I'd use Magic Circle / Prot evil as a precedence ... if you have another "sort of" personal effect happening that isn't large enough to encompass him ... then just treat it as a personal effect .. (just like the Magic Circle / Prot Evil example ... )

For harmful effects, such as fireball ... no special consideration needed ... if you get "clipped" by any amount .. you are affected ... fully .. period ... as per the rules ...

What other cases are there?

If it's harmful and any part of you is in the area - you are effected fully.
If it's beneficial, and the area effect isn't large enough to cover all of you - then consider a personal effect.
If it just covers part of you because you are part in and part out ... (like say just 5ft inside a 50ft radius effect), then you are affected normally ....
*Shrug*

 

[mvincent]

Grid intersection. Choose a corner and put an X at that corner. 10ft in all directions from that spot.

This seems to imply that (say) a cleric in an antilife shell could still be reached pretty easily with a reach weapon.

Indeed, this spell would be completely useless to an Elder titan... but yet he still has it (not saying I disagree with you... merely noting the oddities)

 

[James McMurray]

The Elder Titan also has Alter Self, but as far as I know there are not plants that are no plant creatures with 5 or fewer hit dice that are also gargantuan or larger. Perhaps the designer of the titan didn't realize the hit die limit on alter self and thought the big guy might shrink himself then hide in a buble?

And yes, you can get around antilife shell pretty easily with a reach weapon. That's a good thing though. ALS is one hellacious defensive buff, even with that weakness attached.

 

[moritheil]

Bizarre. I always considered such an effect to radiate out from the caster no matter how large the caster was. So for AMF, "10-ft.-radius emanation, centered on you," would mean that whatever squares the creature occupies, plus whatever other squares are out 10' from that, are within the field.

It's the simplest way to do it, and you don't have to sit around thinking "Where should this imaginary point be placed?"

Could you cite the rules text that demands a single point as the center of emanation? Basing it off MCvE is a little weak for an overriding rule IMO.