The Power Of A Time Spirit!
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At the end, I was able to satiate my curiosity and discover that the [Time Spirit Summon] Spell I created allowed me to summon the people from the Ancient Past Realm I created from the Cloudia Divine Dungeon. After all, all the people there ended having to become Time Spirits to remain within the existing world.
The Realm became pretty much a replica of the past, a fragment of time itself that had been left behind when Arcadia was destroyed, and then revived, these fragments of ancient pasts are the "Cloudia Fragments" which represent an area of the ancient continent of Cloudia.
Although they were technically Spirits, their bodies and everything else was very much like any living being, at least within their domain, so I never thought about it too much.
Until now, when I ended accidentally (?) summoning little Titania here!
"Are you really auntie Planta?" she wondered.