Really big monsters and Antimagic Fields

[FearlessGnome]

Antimagic Field has a radius of ten feet, centred on the caster. If they get in a fight, all magical weapon properties get suppressed and it's just masterwork. Easy enough. But what if the caster is large enough and has enough reach that they can attack out of the antimagic field? Does the (melee) weapon retain its magical properties when striking enemies outside of the field? Say it's a Large creature with a reach weapon - they can attack things 15-20 feet away, but not 5-10. So they can't even attack things that are inside the field. Is the weapon suppressed anyway because the wielder is?

Since I'm on the topic, a Gargantuan creature takes up 20x20 feet. If they cast Antimagic Field, they are subject to it and noone else (barring grapples, ongoing bull rush, etc), but an attack striking them goes into their square and is suppressed before it connects. But what about a Colossal caster? Can people strike them with magical weapons and get the benefit of their enhancements while the Colossal creature itself has its magical protections suppressed, or does the attack get suppressed because the creature being struck is subject to antimagic, even though the square the attack happens in is not within the area of the spell?

[AlanBruce]

But what if the caster is large enough and has enough reach that they can attack out of the antimagic field? Does the (melee) weapon retain its magical properties when striking enemies outside of the field? Say it's a Large creature with a reach weapon - they can attack things 15-20 feet away, but not 5-10. So they can't even attack things that are inside the field. Is the weapon suppressed anyway because the wielder is?

If the entire weapon is able to attack outside the AMF's range, then I'd rule that yes, it retains any magical properties.

If it's a buff on a natural weapon with creature with reach, who is inside the AMF... probably not, since he cast the spell on himself in the first place and his body is inside the field.


Since I'm on the topic, a Gargantuan creature takes up 20x20 feet. If they cast Antimagic Field, they are subject to it and no one else (barring grapples, ongoing bull rush, etc), but an attack striking them goes into their square and is suppressed before it connects. But what about a Colossal caster?

The spell states the area:


Area:10-ft.-radius emanation, centered on you

The spell isn't limited to medium size. If the caster is Gargantuan and he casts AMF, he will have his 20x20 feet of space in the map, plus a 10ft radius emanation around him.

[FearlessGnome]

The spell isn't limited to medium size. If the caster is Gargantuan and he casts AMF, he will have his 20x20 feet of space in the map, plus a 10ft radius emanation around him.

Is this how it works? That would certainly make the spell more useful for larger creatures.

[Beheld]

Regardless of the shape of the area, you select the point where the spell originates, but otherwise you don’t control which creatures or objects the spell affects. The point of origin of a spell is always a grid intersection. When determining whether a given creature is within the area of a spell, count out the distance from the point of origin in squares just as you do when moving a character or when determining the range for a ranged attack. The only difference is that instead of counting from the center of one square to the center of the next, you count from intersection to intersection.

...

Most spells that affect an area function as a burst, an emanation, or a spread. In each case, you select the spell’s point of origin and measure its effect from that point.

...

An emanation spell functions like a burst spell, except that the effect continues to radiate from the point of origin for the duration of the spell. Most emanations are cones or spheres.

You can rule that larger creatures have to pick a point of origin in the middle of them, or you can allow them to pick any grid intersection adjacent to them, like medium creatures, but in neither case does an AMF cast by a Gargantuan Creature cover more area than if cast by a medium creature, since you have to pick a specific grid intersection as your point of origin.

The PHB even specifically uses Globe of Invulnerability (10ft Radius Emanation, centered on you) as an example for emanation spells.

[Anthrowhale]

With regards to the OP, the Rules Compendium says something like "if either source or target are in an AMF then magic weapons are suppressed".