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Does T.P.K. remain in your scorekeeping area "waiting" for one hero of each class, or do the heros already have to be there?
It doesn't seem clear to me what happens if the required heros aren't already present when you play T.P.K. Does it just go to the discard pile in that case?
again ask here http://www.boardgamegeek.com/thread/898432/boss-monster-prot...
also, it is likely that it can only be used IF the requirements are met.