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Message: <blockquote data-quote="Derren" data-source="post: 1686055" data-attributes="member: 2518">I have an idea for a new homebrew world but I need advise on the history.The world would be psionic only (the MM monsters would have their SP abilities simply changed to psionics)The basic idea is that on a world similar to earth a genetically engineered virus used for "human perfection" (inspired by resident evil) escaped and started to spread around the world, unlocking the higher brain functions (psionic) and mutating uncontrolled which resulted in many different types of virus which created the different races changing humans and animals alike.The actual campaign world should take place some hundered years later in an late medieval/early renaissance style world where no one knows what happened in the past or that there even was a technological society.My problem is finding an event which explains how a whole world forgets their advanced society and removes all evidence of it. I don't think that the virus alone is enough to do that.Maybe a desperate try to stop the virus with nuclear weapons what some nations used as excuse to launch a nuclear first strike on old enemies would work, but I would prefer less permanent things (radiation etc.).Has anyone as idea what could have happened?</blockquote>