How do you unlock the weird door with a symbol in the ruins of Kordana in Dragonfable

There is a key... but it's not just a key, it's also a weapon, the key is a weapon called Cordemi Codex. Just go to that door while you have a Cordemi Codex in your bag (you don't have to equip it), How did I find out? When I got a look at the weapon, it's first form was like a key and it had that same symbol on both of them and the Cordemi Codex was like a weapon from the future and you happen to be in a mech from Mechquest, which is made by the same organization that made DragonFable which takes place in the future. Back to the point, it can be a begginer, normal, advanced or master Cordemi Codex. The thing behind the door is a Vendatron shop from the future that only accepts dragon coins for what was very rare objects. I swear, I'm not making this up because it all makes sense and if I was making it up, part of it wouldn't make sense. How do you get the Cordemi Codex you ask? Buy it for some dragon coins in Cysero's shop located in Falconreach.