So... This is partly based on an idea of a species reversing through stages I think someone had ages ago... I think it was agreed on. Whoever had that idea, I'm glad you had it, because it made me think ages later, which I find is when I think of a surprising number of things. Basically, when you reach sentience (all stages civilisation onwards), you are capable of reversing through stages, right back to tribal, if your civilisation has a great disaster, which results in the collapse of civilisation. ...
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