Theory Why no one came back from Zonia/Why Acnologia was at Mount Saint Zonia

[Cat Sidhe26]

I was rereading the chapters when Mount Saint Zonia appeared and I noticed these rocks with these unknown symbols on them and I thought of an idea of what they could do which is these rocks with the unknown symbols has some kind of time magic or is some kind if portal attached to them that sents those who touch the unknown symbols forward in time or to Tir Na Og (the homeland of the fairies and the land of eternal youth) which would explain why no one came back from Mount Saint Zonia. But as for why Acnologia was at Mount Saint Zonia Acnologia was probably sealed on Mount Saint Zonia 400 years by Angel Saint Micaldi and was accidentally unsealed by Gildarts after Gildarts got the Mount Saint Zoina causing Acnologia to attack Gildarts and Angel Saint Micaldi was mostly the one who saved Gildarts.