@,
"Very well. We'll note for the emperor." Royal Guard said and told other Royal Guard to go tell Emperor that diplomatics are requesting enterance... With real honor.
Later: Messagner Royal Guard returned to the gates and told the gate Royal Guard Emperor's answer. He nobbed and turned back to the diplomatics.
"The Emperor has agreed to yours visit. He has invited you to visit his castle. Gates will open. Welcome to the Crystal Lands."
Royal Guard greeted and then, the big but not "so" big crystal gate doors begun move away from themselves, one inside the left head and other right head. Then: There was a free road to their castle and they could see a lot of busy ponies around, doing their things. Most are smiths and food makers.
Meanwhile at the Castle:
Blue Crystal was staring out from the window, as the gates opened.
"First visitor for so long time... I am glad to see, that we are not alone." he thought and then turned towards 2 of his body guards.
"Go to make preporations, we shall meet these visitors with honor. Make haste." Blue Crystal commanded. The body guards bowed and then left to tell others to create preporations quickly.