A Neutral Killing role can be an Arsonist, a Mass Murderer, or a Serial Killer. Neutral Killing roles win by killing anyone who would oppose them, including the Town, the Mafia, the Triad, the Cult, and other Neutral Killing roles. They can win with Neutral Evil roles (excluding the Cult).
Neutral Killing roles have many disadvantages: they have no allies and few abilities to help them stay hidden. In order to win, they must stay alive as long as possible and stop other teams from gaining command over the game.