LitRPG: I Evolved Demonic Beasts At Doomsday

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Ding... Super demon beast synthesis system has been successfully bound. Host, please proceed with demon beast synthesis as soon as possible.
The powerful demon beast that humans feared in the apocalypse, to Yang Kun, was a powerful amount of spirit energy. Ding! Synthesis didn't require painstaking cultivation, cultivation level increased by leaps and bounds, Rushing Duck! Synthesizing a Mountain and Sea Scripture was far from enough.