Summoned creatures of any type wink out if they enter an antimagic field. They reappear in the same spot once the field goes away. Time spent winked out counts normally against the duration of the conjuration that is maintaining the creature. If you cast antimagic field in an area occupied by a summoned creature that has spell resistance, you must make a caster level check (1d20 + caster level) against the creature's spell resistance to make it wink out. (The effects of instantaneous conjurations are not affected by an antimagic field because the conjuration itself is no longer in effect, only its result.)
For game purposes, they basically stop existing until the antimagic field moves or disappears. The summoner ought to be able to dismiss and resummon the eidolon, though.
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There seems to be a lot of conflicting terminology when it comes to the anti-magic field and the eidolon. I have thoroughly gone through eidolon and anti-magic field to see what I can come up with seeing as I can't find an official post anywhere. I only see one instance that states that it will dismiss an eidolon.
Summoned creatures of any type wink out if they enter an antimagic field. They reappear in the same spot once the field goes away. Time spent winked out counts normally against the duration of the conjuration that is maintaining the creature. If you cast antimagic field in an area occupied by a summoned creature that has spell resistance, you must make a caster level check (1d20 + caster level) against the creature's spell resistance to make it wink out. (The effects of instantaneous conjurations are not affected by an antimagic field because the conjuration itself is no longer in effect, only its result.)
And this line most people seem to think overrides the entire rest of the description of the spell. the very first line is.
An invisible barrier surrounds you and moves with you. The space within this barrier is impervious to most magical effects, including spells, spell-like abilities, and supernatural abilities. Likewise, it prevents the functioning of any magic items or spells within its confines.
While an eidolon does count as a summon it is not labled with SP, SU, nor is it a spell.
It also states that it does not affect conjurations with an instantaneous duration. If you wanted to treat summoning an eidolon as a spell or spell like ability and format the power out into a spell format. it would either have a duration of
Permanent
The energy remains as long as the effect does. This means the spell is vulnerable to dispel magic.
Or instantaneous
The spell energy comes and goes the instant the spell is cast, though the consequences might be long-lasting.
The eidolon cannot be sent back to its home plane by means of dispel magic, but spells such as dismissal and banishment work normally.
Since it is not subject to dispel magic that would mean the duration is instantaneous. and thus not subject to antimagic field.
In addition, due to its tie to its summoner, an eidolon can touch and attack creatures warded by protection from evil and similar effects that prevent contact with summoned creatures.
I would also rule that this would be a similar effect that would prevent contact with summoned creature since it does exactly that.
I have also seen people post that if a summoner enters an antimagic field it ends his life link ability and sends the eidolon whisking back to its home plane. if that were the case here is the first line of the spell unfetter. This spell breaks the life link between you and your eidolon. That would be a pretty dumb spell if it just sent your eidolon home.
My personal opinion is that unless there has been an official faq post it would not affect an eidolon. sorry for the long post but eidolon vs antimagic shell full of contradicting wording.
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While an eidolon does count as a summon it is not labled with SP, SU, nor is it a spell.
The Anti-Magic Field rules pertaining to summoned creatures are specific and do not mention SP, SU, spells, or anything else regarding how the summoned creature came to be.
The rules on this are black-and-white and self contained. Since the eidolon is a summoned creature it cannot exist inside an AMF. It winks out until the field moves on or it is dismissed.
The eidolon cannot be sent back to its home plane by means of dispel magic, but spells such as dismissal and banishment work normally.
The eidolon has a specific exemption to Dispel Magic, but in all other ways is labeled and behaves as a product of the Summoning sub-school not the Creation sub-school.
The eidolon requires the continued presence and consciousness of the summoner or it disappears, it disappears if killed, does not actually die if killed, requires 24 hours to reform if killed.
The Creation sub-school, on the other hand, defines exactly how instantaneous magic works. None of the above apply to a created creature.
It does spinoff into other weird questions, like can you summon an eidolon that has disappeared due to the anti-magic? Or can you use the summon monster SLA while the eidolon is missing?
If I recall correctly, the eidolon has not actually been dismissed or banished and will come back immediately if the anti-magic field is taken down, but if that is correct, that raises the question of how the eidolon would respond to events that would normally result in its banishment or dismissal when it is cut off from its summoner's magic by a more or less permanent anti-magic field.
Is an eidolon that ceases to exist too far away?
If the eidolon is more than 10,000 feet away, it is immediately returned to its home plane.