The Complex of Zombies
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RPGs have variable players and duration.
The Black Mist
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In 'The Black Mist', heroes are trapped in a quarantine city plagued by a magical plague and necromancy. This mini-adventure for four 3rd-to-5th level characters offers new rules for plagues, fire, and mobs, plus spells, magic items, and handouts. It is perfect as a standalone session or campaign addition for the D20 System.
RPGs have variable players and duration.