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Message: <blockquote data-quote="NotAYakk" data-source="post: 8031089" data-attributes="member: 72555">The disease they are weak against ... is magic!The magicclorions which are omnipresent and infuse this era with magic that is.They use technology and psionics.Even their time travel doesn't work well with magic.  So they have to invade backwards through time past the edge of what they have conquored.To fuel their tech/psionics, they actually eat the magic of the world as fuel (humans find oil toxic, but useful).  Once they do so, they jump back again and conquor another piece of time, then strip mine the magic again.Even if the PCs win against this invasion, the mind flayers have already won in the PCs future.  In order to stop the mind flayers, they have to time travel themselves to the start of the chain.They can't go just anywhere with time travel; only places just before the mind flayers strip mine the magic are valid targets.  But the last time they did this in the far future was also the first time; by attacking then, the PCs can put an end to the mind flayer infestation forever and always.Of course having done so they erase everything that happens to them since the mind flayers invaded.  So you then cut back to the scene where the much lower level PCs first saw evidence of the invasion and have it not happen.So, for setup, have the invasion end some big threat the PCs where getting ready to fight.  The mind flayers had access to history, and smashing a rival power as an initial move makes sense.The PCs on the pruned timeline naturally manage to send back help somehow before ceasing to exist.</blockquote>

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