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Taking a look at all the spell descriptions I would say the Eidolon couldn't use any abilities using another plane to allow for movement on the prime-material. (i.e. ethereal jaunt lets you go from prime-material to ethereal then back to prime-material again). However, dismissal and banishment don't fall under that. They are one way to another plane and without additional aid the Eidolon can't come back to the prime-material on its own.
Taking a look at all the spell descriptions I would say the Eidolon couldn't use any abilities using another plane to allow for movement on the prime-material. (i.e. ethereal jaunt lets you go from prime-material to ethereal then back to prime-material again). However, dismissal and banishment don't fall under that. They are one way to another plane and without additional aid the Eidolon can't come back to the prime-material on its own.
But a dismissal ar banishment technichally is trans-dimensional travel, isn't it? would they even effect the eidolon if it was dimension locked?
DA has a pretty clear list of what it prohibits, and neither banishment nor dismissal is on the list...
It says it includes, but it doesn't say it's an exclusinve list. I'm not saying it should, but it seems like it could, since it says it prohibits all trans-dimensional travel. Of course, on the other side, when a summon spell ends it still ends as normal. It just seems like it should say if it does or doesn't, because it seems kinda lost in the middle to me.
This is what I originally thought as I saw your post yesterday. When there weren't any responses to it I thought I'd take a look at the 3 spells in question and formulate a more thought out opinion.
Part of the text for dimensional anchor states
Also, dimensional anchor does not prevent summoned creatures from disappearing at the end of a summoning spell.
This is partly where I'm drawing my conclusion of dismissal and banisment working. The other part is the fact all of the spells listed as barring movement in dimensional anchor are initiated by the caster (in this case it would be the eidolon) dismissal and banishment are not. I also think the intention of dimensional anchor is to limit one's ability to use other planes for transport of the physical form on the prime-material.
My take is this...If a creature is under the effects of a dimensional anchor they can take no initiated action to provide themselves with an escape route involving extradimensional travel.
I could be wrong on any or all points...so take what you will.
This is just my 2 cp worth.
