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The Elves had the power to manipulate nature and that included trees. Why would they even build an actual wall made of stone or whatever when they can just employ the trees of the woods for the same purpose? They were able to control all the trees using magic, and over many years, they formed an enormous and tall fortress and walls made of living trees which were all coiled against one another. It was as tall as 50 ~ 60 meters, and it was quite beautiful.
"As I explained before, this fortress and the walls were made by us Elves over many years… With this and the help of the Guardian, we had been able to fend off the armies of demons and humans for a while…" Said Elfina. "Phew, I am happy that I'm finally back home though…"
"Elfina is it true you were kidnaped? You never told me any of that." I said.
