Talk:Overlord Volume 10/@comment-28662320-20160623164647/@comment-28662320-20160623181047

Platinum Dragon Lord  took up residence in the former guild base and took on the task of guarding their magic items to ensure no one would ever be able to misuse them.

... their floating castle, Eryuentiu.

from this wiki about 8Gk. I am sure you can find  confirmation after reading interludes about them

the same for 6GG :

... their legacy still exists through the country they founded, Slane Theocracy and their descendants...

also in intermission of vol10 there was mentioned about sacred room which high ranks of ST cleaned. I doubt that if its just simple temple they will put so much efort in it...