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In my opinion, it’s better to assign the joined creatures from Dungeon to the second hero, so they can gain some experience. Also, with Inferno, you can still get experience by sacrificing unnecessary neutral creatures. Besides, in Academy, the Pit isn’t needed for building other structures, and building it is, in my opinion, not worthwhile. Resources can be spent on more important things, especially if you’re playing as a hero. But with Inferno, you definitely need to build it, because without a castle, you can’t really play for long.