A Serial Killer is a player whose goal is to be the last player alive. They are aligned with themselves (meaning they have no allies) and have a factional kill at Night like the Mafia. Depending on the flavor, SKs may also be called Cannibals, Psychopaths, or Arsonists (note that Arsonist has since grown to describe a unique role).
Most moderators will not allow Towns or Mafias to win while a Serial Killer is still alive.
Serial Killer is the most difficult standard faction to win as, since being the sole survivor requires the player to dodge all of the Town's lynches and the Mafia's Night-kills. Thus, a few common variations have arisen.
- In games where it is possible for every player to die, the Serial Killer is sometimes awarded the win.
- Serial Killers are often given One-Shot or unlimited Bulletproof. This stymies the Mafia's attempts to kill the SK, if temporarily.
- Serial Killers have also been seen with investigation immunity like Godfathers, or Tracker/Watcher immunity like Ninja.
They are generally given a boost of some kind; what that boost is varies from game to game.
In very complex games, Serial Killers can be complex roles unto themselves that just happen to have a factional kill and a self-aligned Win Condition.
Use and Power
Serial Killer exists to ratchet up the death count per Night and raise the swing of the game tremendously due to the SK's independent motivation. These are somewhat desirable in fairly stable Large games, but in role madness or smaller games SKs tend to lead to uncomfortable situations where their actions play a disproportionate role in deciding the game. This can be mitigated somewhat by including a Vigilante instead.
If you draw Serial Killer, do not claim NK-Immune Miller Vig. Although since that meme has appeared, some moderators actually have included that very role in their setups... Nonetheless, you are usually best off not claiming to be a Vigilante if you are a Serial Killer unless you are incriminated by a Tracker or Watcher result.