Fast setup that is relatively balanced with a lot of variables and possible outcomes. Arsonist has to coordinate with stalker to douse correctly, and runs the risk of killing own traitors if he does light the match. The existence of two mafia rather than 1 makes vigilante n1 autowin impossible, and makes it harder for town to win just by lucky shots. Lightkeeper adds another interesting layer to the game; cop can out reports to vig and stalker can try to mislead. If there is a mason-majority, the masons can also lynch during this time without fear of being doused or killed.