Does Antimagic Aura affect the caster?

antimagic field says:

An aura of antimagic surrounds you in 10-foot Emanation. No one can cast spells, take Magic actions, or create other magical effects inside the aura, and those things can’t target or otherwise affect anything inside it. Magical properties of magic items don’t work inside the aura or on anything inside it.

But the emanation rules say:

An Emanation’s origin (creature or object) isn’t included in the area of effect unless its creator decides otherwise.

And, while one could argue that "No one can... inside the aura" includes the caster, the definition of emanation specifically excludes the caster, so they're not inside the aura, just completely surrounded by it. (And yes, I'm aware that can be considered to be "inside" the aura in some senses of the word.)

Now, legacy antimagic field definitely includes the caster. This is just a knock-on ambiguity from defining emanations. But I'm curious to see what people think.

Bonus question: 

If we accept the idea that the caster is not inside the antimagic field, what does that mean in terms of spells cast by or on them?

Quote from jl8e >>

An Emanation’s origin (creature or object) isn’t included in the area of effect unless its creator decides otherwise.

 

And, while one could argue that "No one can... inside the aura" includes the caster, the definition of emanation specifically excludes the caster, so they're not inside the aura, just completely surrounded by it.

I'd say that the rules of Emanation clearly makes it the casters choice if they want to be inside the are or not.

Quote from jl8e >>

(And yes, I'm aware that can be considered to be "inside" the aura in some senses of the word.)

Not in the way that the rules use the word though and that's the one that matters.

Quote from jl8e >>

If we accept the idea that the caster is not inside the antimagic field, what does that mean in terms of spells cast by or on them?

It means that the caster isn't affected by the AMF but at the same time is quite restricted by it. Spells with a range of self should still be castable but not much else as he can't extend any magic outside his own form.

I'd argue that even the effects of magic weapons wouldn't operate against anything struck within the field (such as if a Fighter casts the spell via Enspelled Armor). The target is in antimagic.

Quote from jl8e >>

antimagic field says:

An aura of antimagic surrounds you in 10-foot Emanation. No one can cast spells, take Magic actions, or create other magical effects inside the aura, and those things can’t target or otherwise affect anything inside it. Magical properties of magic items don’t work inside the aura or on anything inside it.

But the emanation rules say:

An Emanation’s origin (creature or object) isn’t included in the area of effect unless its creator decides otherwise.

 

 

This may or may not be intended, but based on how this is written, if the spellcaster chooses to not be included in the aura then an ensuing spellcasting battle with an enemy that is located outside of this 3D donut-shaped AoE would pretty much proceed as normal.  For example, such an enemy CAN target the spellcaster with Magic Missile and our spellcaster CAN target such an enemy with Magic Missile.

Antimagic includes you.  You are by definition in any Aura that emanates from you.  Always.

Quote from Mog_Dracov >>

You are by definition in any Aura that emanates from you.  Always. 

This is incorrect per the actual rules in 5.5e.

Emanation AoEs only include the origin if the caster chooses to. This is explicitly stated in the definition of Emanations, which jl8e and up2ng both quoted above.

Quote from up2ng >>

This may or may not be intended, but based on how this is written, if the spellcaster chooses to not be included in the aura then an ensuing spellcasting battle with an enemy that is located outside of this 3D donut-shaped AoE would pretty much proceed as normal.  For example, such an enemy CAN target the spellcaster with Magic Missile and our spellcaster CAN target such an enemy with Magic Missile.

I can't see why it would be donut- shaped, the emanation extends in all directions so you would be inside a small (5ft) sphere that is inside a bigger (25ft) sphere. There shouldn't be any path from the spellcaster to the outside of the emanation that isn't blocked by the AMF.