I Killed the Player of the Academy - Chapter 181: Contact (1)

... e an underground city created by Dagda Mor, the Danann of Earth, in the distant past.

This enormous underground city, which had been made for fairies, was now the hiding spot of demi-humans who gathered in the city to escape persecution.

-Clomp, clomp

At the center of that underground world was a large temple-like building. It was a temple at the start a temple built by the fairies to make offerings to the Danann of Earth who created the underworld of Dana Shee for them. ...