For any sacrificing you'll need a Temple, at least 3*3 square big. Pick up the creature you want to sacrifice, and drop it into the central pool of your Temple.
Im 15 and I'm a huge Dungen Keeper fan! I'm currently on the level right after the one where you start out with 2 horned reapers. This game is one of best P.C. games I ever played!
P.S. Keep on...
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