Usually because those muds try to balance "powerful" options against weaker options by making them require more work.
Personally I strongly dislike that idea - requiring more effort to have a more powerful character still leaves you with some characters being more powerful than others. Within a competitive environment, players are pretty much forced to take the more time-consuming route in order to remain competitive.
So basically, no, there are no additional requirements. All of the classes represent powerful supernatural beings, and each require just as much effort to build up.
No, although anyone can take the dragon-oriented talents (Dragon Blooded, Red Dragon Descendant, etc).
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