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This game is set to work with the exact mass market TTRPG ruleset you think it is. 

It’s Candlenights, the most magical time of year in a world already full of magic! The quiet suburb of Genomosville has long avoided the perview of any ner do wells, but that all changed when an adventuring party chose to make it their base of operations. They’ve been called away on a grand quest, and left their children under the protection of the castle staff. Unfortunately, the staff all got drunk off their butts on cooking sherry during the annual holiday party. Ordinarily, this wouldn’t be a big deal, however your parents’ oldest enemy, Gnome de Plume, has declared he intends to steal back the treasure they had taken from him. It’s up to you and the other children to save your parents’ questionably attained riches.