User blog:Niohoggr/NPC's character construction

On the novels it is said that when a guild conquer a dungeon then can convert it in their base and create NPCs to defend it. What I want to know is if you believe the "dear shitty devs" would allow the players to freely choose any kind of powerful class to give to their creations. I do not think that's the way of the developers of Yggdrasil. So how is that the players get the job and racial classes for their NPCs?

My theory is that a special item is necessary, something like a card or roll, and meeting some requirements they can obtain the rights of a determinate class on that item, to spend it on their NPC. The requirements would be the same that the players have to meet in the game, or maybe slightly different. What do you think about it? What kind of system would be used to construct the NPC's classes?