I would say have the players create their characters then to demonstrate how deadly MP combat can be have half of the PC's fight the other half starting about 30 meters apart. Like the gunfight at the OK corral. This lets everybody practice the combat procedure.
I agree with Cosmicfish. Pick two or three of the survivor groups and create an encounter with each one. One encounter could be a bought badge in a small community of fifty souls, that is about to start a trial of an innocent teen accused of murder framed by the mayor's son as vengeance for his spurred advances. Another encounter could be larger community of about 300 medievalists with knights and ladies serving in court that have caught a (real or perceived) witch with psi powers. Be prepared to improvise.
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