Ok well
6 Townies
3 Vengeful Mafia
Each day before 50% of the deadline is reached, players must grow a crystal. The player chooses its color, and whether it is townie or scummy inside (town have little reason to choose the latter). There is red, orange, yellow, green, blue, and violet. Players can't grow crystals in a color they already have. Crystal color is public but crystal alignment is not.
Players cannot be voted directly, but their crystals can be voted. Majority voting a crystal destroys it and reveals its alignment. When a scummy crystal is destroyed all other crystals with the same owner are destroyed and the crystal's owner flipped and removed from the game.
Crystal growth is mandatory, if a player forgets to grow a crystal, the mafia pick one matching that player's alignment to be grown.
Night zero and each night, instead of a kill, the mafia may choose a town player whose crystal grown that day will be hollow. Hollow crystals aren't counted towards win conditions. If they are destroyed, it isn't shown that they were hollow, just the alignment.
The mafia wins when there is a scummy crystal of each color at the end of a night phase.
The town wins when there are two townie crystals of each color, owned by townies (townie crystals in mafia possession don't count for anyone, just like hollow crystals.) at the end of a night phase. Scum wins ties.
I'm trying to fill the last two spaces for this setup you-know-where, if anyone wants to be shamelessly poached