Mafia: general discussions.

1. Modkill always ends the day during daytime.
2. When a role is revealed during any discussion, the player's team loses the ability to perform Night Actions on the night following the modkill.
3. Manipulating the threat of a modkill directly leads to a modkill with subsequent effects (points 1 and 2).

If desired, a point regarding participation in the next game can be added, although considering the number of players, it might not be necessary.
But the most important thing for people to remember is that they can also be GMs, and if they treat other people's games this way, no one might sign up for their games in the future, etc.