Condemner Mafia

Lyncher Mafia is an open setup game devised by mathcam. It's particularly popular on scumchat.

Roles

One of the townies (but not the mafia) will be randomly designated the Lyncher's target (or Lynchee), and will be known only to the Lyncher.
The Mafia wins when only he and one other player are alive.
The Lyncher wins, and the game ends with no other winners, if the town lynches the Lynchee, when the Lyncher is still alive.
The Town wins when both the Mafia and Lyncher are dead, or when the Mafia is dead, and the Lynchee has been killed at night.
Typically the game only ends in a Draw when the Lyncher and the Lynchee are the last two people alive.
The game starts with day, which then alternates with night.
During the day, a simple majority is needed to lynch or not lynch. However, typically (especially on scumchat) the town is not allowed to vote to lynch no one.
During the night, the Mafia makes a kill choice if he is still alive. If not, nothing occurs, and day follows immediately.
The moderator reveals the role of every player who dies, but not whether a player was the Lynchee. (The obvious exception is if the Lynchee is lynched when the Lyncher is still alive, as this ends the game.)
If the Lynchee is killed in the night, the Lyncher becomes a Townie and wins with the town. Note that the moderator does not reveal whether the Lyncher has become a Townie.

One variation is having No Lynch as a possible Lynchee. This means that if the town votes for no lynch, then the Lyncher will win.
Sometimes the Mafia can be a possible Lynchee.
Another variation is if the Lynchee is nightkilled, then the Lyncher will stay anti-town but can no longer win the game unless he is left with one townie at the very end.