OK, this is kind of a cheat (well, not really) way to get your levels back, ONLY if you have bought the Resurrection Rod from the Adventurers Mart. When one of the NPCs has been level drained to the point where they are back to level 2 or whatever and effectively useless, just kill them and ressurrect them with the rod. They will get all their levels back. This is useful if they get level drained really far from the city and you can't get to a temple.
Oh by the way this only works with NPCs, as we all know what happens when you die...
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