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they are underground bases, you get them once you get your town hall to lvl 5. First a random rock will come out of the ground, and inferno monsters will attack you. That will happen a few times, and each time it happens, the rock comes out of the ground more which creates the entrance to the inferno. once the entrance is fully out you can go inside and take out the 6 inferno bases to get your very own inferno outpost!

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