Not too much detail, 'cause I can't prove my players don't read this board...
But anyway, what might drive an advanced civilization into hiding? Only a small enclave of them now remains.
And we're talking darn advanced--quantum computers, programmable matter, instant wormholes, etc. etc.
Frankly I'm a bit stuck on this episode.
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"Real programmers don't comment their code. If it was hard to write, it should be hard to understand." -Anon.