Lifeforce is needed to make new minions. The lifeforce is in 4 variants: Brown to make brown minions, green to make green minions, red to make you red minions and blue for your blue minions. you can harvest it from (most) creatures. however you only can harvest one sort lifeforce in Overlord: Dark Legend. Lifeforce appears in Overlord , Overlord: Raising Hell , Overlord II and Overlord: Dark Legend.
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