Eli saw the souls of her former party members before meeting with Hydaelyn. While they didn't directly opened a way or did some specific action (like the other souls that came to help in the Altiascope), feeling their presence alongside her helped Elina to focus while fighting.
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(E.W. spoilers ahead)
During The Aitiascope we see the spirits of several companions aide the Scions as they traverse deeper into the aetherial sea. Is there someone in your WoL's lore who you believe also would have been there to aid them? What would they have done?