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Planeshift\'s EVERYTHING is completly custom, begin a MUD is not different, because the same player advancement system is in place. At the same time, its not entirly like the ES series because you cant just swing a sword and get better.
In regards to the original question \'Isn\'t PS kinda like ES 3\', yea it is in regards to the fact that its not level based, but besides that theres really not much in common, in fact nothing in common. You cant just buy a glyph and shoot off a spell to get better in PS, it\'s harder than that.
However seeing as how ES is the only other \"major\" game that has a non levling based advancement, I see why its easy to compare the two systems.
to say one thing had the original idea is ludacris, in this particular area since there are only 2 ways to go. Planeshift jacked no one, and the idea is all their own.