Hi, thanks for playing. I think you got it wrong, the lv4 barrack requires 1 troop of each other types which means in order to spawn a DEMON, you have to sacrifice 1 naked dude, 1 archer, 1 knight and some meat, gold in order to spawn them out. And the game is unbeatable if you don't spawn lv4 units btw:v. Hope this help you!
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Ah you mean you have to have 1 of each unit already on the board in combination with all those resources? I guess it's possible I didn't have enough units and/or resources when playing for the level 4 barracks to be able to create even a single demon, so that may explain it. I think what I might do is see if I could try it again sometime, thanks for your reply.