Well, some of you could have played in servers that worked like this. But if you don't know how it works i will try to explain it.
It goes like this. You can buy Grade S armors and Dynasty Armors in the gmshop, but they are sealed. To unseal them, you must register in seven signs, and go kill some monsters in the Necropolis/Catacombs to farm stones to exchange for ancient adena. You have to wait for the wining period of seven signs to go to the blacksmith of mamoon. there you can unseal the armors with ancient adena.
Well, any problem about this, just report please.
There can be changes anytime, with previous warning.