I think a cool feature to be implemented would be a "rebirth" feature. were you get set to level 1, but with a stat boost or +5 max level or somthing like that. also, "freeplay" would be nice.
It'd basically be a faction with repeating quests, but they get infinatly harder, and you can keep playing after defeating the king. this'd go hand-in-hand with the rebirth feature I mentioned above. BUT, If you do the +5 level cap on rebirth, you should make it so you can only rebirth 1 or 2 times. this would also call for a raise in max Skill limit. from 99 to 199 or 150 maybe?
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