looking for help with a valindra shadowmantle encounter

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I am trying o plan out various possible adventures and encounters abit in advance for various things my players can do in neverwinter.
I had a plan to have them fight valindra in the place under castle never where the neverwinter nine is buried and have her at various points bring some of them back to life.
 To represent them I sortof wanted to mix a white with various player classes to make them seem like they were also adventurers at one point and each would have a magic item. or something 

however I didnt want my players to be totally overwhelemed so I was wondering if anyone has done something similar to this and if so how did you handle it and at what level?