Afterthought:Afterthought: I'm aware your question asked for a method of farming\exp gain that did not require a lot of prep, but this was the best compromise I could come up with. Realistically if your trying to to get 'quick and easy' you could still use this method and only include the single first floor in your 'tower'. (which I suppose would then be a warehouse instead of a tower, heh). Then when your feeling bored or otherwise motivated you could add on to it as you see fit. I'm not sure what else to say to the 'lack of prep' feature. Asking for safe exp grind without prep is kind of like asking for free money, it just doesn't realistically happen.