Hi i have 3 question
How can i enter in the town on the dessert(forgot the name)sundry
How can i trigger the hidden in sundry celestial i keep going there but still not discover
And what is the purpose of talking stone?
#1- It's been a while so I can't really remember but I'm pretty sure that if you progress through the story enough it will automatically be added to the map.
#2- In the ruins located in the Sundry desert use the celestian object that the elven woman gives you.
#3- The talking stone just lets the demonette call you whenever she likes. She'll call when she has a task for you. Progress though her relationship to make that happen.