According to the description of the Eidolon feature of the summoner the summoner summons an aspect of a powerful outsider.


Considering the eidolon is only an aspect of the powerful outsider, the actual outsider should be stronger than the Eidolon.

Can a summoner use the gate spell in order to summon her Eidolon in its true form to wreak some destruction among his enemies?


The Gate ability could summon the Eidolon, although the Eidolon would be the same creature as usual.

There is nothing in the Summoner rules or Eidolon rules to suggest that Eidolons have some stronger "true form" that exists elsewhere. The class features mention various ways to call/send the Eidolon from/to its home plane, implying that the Eidolon is not leaving some part of itself behind. For all functional purposes, the Eidolon is the creature itself.

While the word "aspect" can refer to a "part" of something, it can also refer to the "form" of something, i.e., how it appears or manifests.

Since there is nothing suggesting that the Eidolon has some greater part elsewhere, I think a more likely interpretation of "aspect" is a reference to how the Eidolon manifests (in terms of its characteristics and evolutions) when summoned away from its home plane.

However, the good news is that a Summoner could potentially summon their Eidolon using their Gate spell-like ability. The spell text says:


Eidolons are named outsiders from another plane, so they should qualify as extraplanar creatures. Note that this method would cost 10,000gp worth of material components.


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